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Knob Clips
PSM Knob Clips are small spring steel fasteners designed to secure knobs, handles, or hubs onto shafts or panels—especially within plastic or mixed-material assemblies. They are a compact, low-cost alternative to inserts or set screws, offering positive retention, ease of installation, and minimal hardware complexity.
Advantages
- Low cost
- Replaces expensive inserts and grub screws
- Fast, easy assembly
- Holds firm
- Easy to remove for servicing
MATERIAL
CS60, CS70 carbon steel
METHOD OF ASSEMBLY:
Push knob clips over hub of knob, line up the flat of the clip with the flat of the shaft and simply push on.
WHEN SPECIFYING, PLEASE STATE:
- Quantity
- Prefix (CBKC)
- Part No.
- Finish code (e.g. 3000 CBKC-0111-00)
Key Features
- Self-retaining design: The clip grips the knob hub or shaft and prevents it from spinning freely.
- Constant pressure: The spring action maintains consistent clamping force even under vibration or thermal cycling.
- Easy assembly and removal: Clips are typically pushed or snapped into place, allowing quick servicing.
- Minimal space and material impact: Because they replace setscrews or inserts, knob clips reduce part count and bulk.
- Versatility: Many knob clip styles, such as D-type, include flats or dimples to align with keyed shafts or flats for secure positioning.
Performance & Application Guidelines
Retention & Durability
- The clip’s spring design should maintain consistent retention force through repeated use and temperature changes.
- Test under load and vibration to confirm that the knob remains securely attached without slipping or wobbling.
Tolerance & Fit
- Maintain tight but adequate clearance between the clip and hub for smooth assembly.
- Avoid large mismatches that may cause over-stressing or reduced grip.
Use Cases & Examples
- Control knobs and dials in electronic equipment
- Appliance handles and rotary controls
- Automotive interior fittings
- Industrial or laboratory instruments where quick knob assembly and removal are needed
Dimensional Data & Sizes
| PART NO. | SHAFT DATA | T | B | G | H | M DIA | N | P | S |
|---|---|---|---|---|---|---|---|---|---|
| 0115 | 4.8 | 0.51 | 4.8 | 12.7 - 12.8 | 1.4 - 1.5 | 4.8 - 4.9 | 4.3 - 4.5 | 4.8 | 4.2 - 4.3 |
| 0119* | 4.8 | 0.40 | 4.8 | 12.7 - 12.8 | 1.4 - 1.5 | 4.8 - 4.9 | 4.3 - 4.5 | 4.8 | 4.2 - 4.3 |
| 0111 | 6.4 | 0.56 | 6.4 | 15.1 - 15.2 | 1.9 - 2.0 | 6.4 - 6.5 | 5.6 - 5.7 | 6.4 | 5.5 - 5.6 |
| 0114* | 6.4 | 0.56 | 6.4 | 15.1 - 15.2 | 1.9 - 2.0 | 6.4 - 6.5 | 5.6 - 5.7 | 6.4 | 5.5 - 5.6 |
*Denotes alternative version
Dimensions in millimetres
Recommended Installation Torque
| SCREW SIZE | lbs. ins | N.M. | SCREW SIZE | lbs. ins | N.M. |
|---|---|---|---|---|---|
| 4 | 6 | 0.68 | 10 UNC | 11 | 1.24 |
| 6 | 12 | 1.35 | 10 UNF | 7 | 0.79 |
| 8 | 18 | 2.03 | 6 BA | 2 | 0.23 |
| 10 | 24 | 2.71 | 4 BA | 4 | 0.46 |
| 12 | 30 | 3.39 | 2 BA | 7 | 0.79 |
| 14 | 42 | 4.75 | 6 mm | 16 | 1.81 |
| 1/4 ACME | 50 | 5.65 | 4 mm | 6 | 0.69 |
| 5/16 ACME | 75 | 8.48 | 1/4 BSW | 20 | 2.26 |
| 2 BA | 7 | 0.79 | |||
| 3/16 BSW | 11 | 1.24 |
| CODE | DESCRIPTION | COLOUR | USAGE |
|---|---|---|---|
| 00 | Blue, oil dipped | Blue temper | Very light corrosive conditions |
| 09 | Phosphate, oil dipped | Dark grey | Light corrosive conditions |
| 13 | Chromate passivated electro plated zinc | Pale translucent yellow | Highly corrosive conditions |
| 08 | Phosphate & zinc chromate paint | Green | Highly corrosive conditions |
| 10 | Phosphate & zinc chromate paint | Black | Highly corrosive conditions |
| 11 | Plastic coating | Black | As required |
| 14 | Polyester | Various | As required |
| 22 | Polyseal | Black | Highly corrosive conditions |
| 24 | Dacromet | Silver | Highly corrosive conditions |
Enhance Your Assembly with Our Precision Knob Clips
Start browsing our products or request a quote today to find the ideal fastening solution for your application.Frequently Asked Questions About Knob Clips
What are PSM Knob Clips (CBKC) used for?
PSM Knob Clips (CBKC) are small spring steel fasteners designed to secure knobs, handles, or hubs onto shafts or panels, especially within plastic or mixed-material assemblies. They are a compact, low-cost alternative to inserts or set screws, offering positive retention, ease of installation, and minimal hardware complexity.
What makes Knob Clips a better choice than inserts or grub screws?
Knob Clips replace expensive inserts and grub screws at a fraction of the cost while delivering fast, easy assembly — push over the hub, align the flat to the shaft flat, and push on. No tools, no threads to strip, no torque to control. This directly reduces in-place cost and assembly time compared to traditional shaft-retention hardware.
How do Knob Clips maintain a secure grip on the shaft?
The self-retaining spring design grips the knob hub or shaft and prevents it from spinning freely. The spring action maintains constant, consistent clamping pressure even under vibration or thermal cycling, so the knob stays firmly in place throughout its service life.
What surface finishes are available for PSM Knob Clips?
Surface finish options are specified by finish code as part of the ordering reference — for example, CBKC-0111-00. Corrosion-resistant finishes such as zinc plating are available for assemblies exposed to moisture or environmental conditions.
Does the D-type (flat-sided) Knob Clip prevent rotation on the shaft?
Yes, D-type and similar knob clip styles include flats or dimples that align with keyed shafts or shaft flats, providing secure angular positioning and preventing the knob from rotating independently of the shaft.