PHFH Self-Clinching Stud
The PSM PHFH P-HFHS SELF CLINCHING STUDS have been designed to achieve higher levels of performance than the P-FH range of fasteners for applications that do not demand a flush finish condition.
Advantages
- Easy to assemble with any squeeze press
- High torque resistance
- Visual proof of security
- Always perpendicular to panel
- Made from through-hardened steel for high thread strength
PFH Self-Clinching Stud Design Guide
Hole Preparation
It is recommended that the holes are formed using a punch operation, although drilled holes may be used.
Hole Size
Holes must be held to a tolerance of -0.00mm + 0.13mm (-.000″ +.005″).
Minimum Sheet Thickness
See product data sheets and method of assembly.
Maximum Sheet Hardness
Rb80 for Steel Studs (P-HFH)
Rb70 for Stainless Steel Studs (P-HFHS)
Installation
Using a squeeze action, apply sufficient force to fully embed the teeth into the host sheet metal, bringing the head in contact with the sheet. See PERFORMANCE DATA for recommended forces. The head of the stud is not designed to be installed flush.
Tooling Note
Studs are installed using a recessed top punch to control the insertion depth and a flat bottom anvil with a clearance hole to
accept the threaded section of the stud. Where the sheet material is thin, a special thin sheet bottom anvil is required which includes a countersink at the top to create space for the clinch ring and displaced sheet material. See METHODS OF ASSEMBLY page for details.
Technical Data
P-HFH & P-HFHS Types (Metric)
MATERIAL CODES
P-HFH – Hardened Steel Zinc Plated
P-HFHS – Stainless Steel
STANDARD PLATING FINISH
Zinc & Clear Trivalent Passivation (Z)
General Dimensions
| Thread Size / Code | Min Sheet Thickness | Rec Hole Size -0.00 +0.13 | Max Hole in Mating Component | Head Diameter E +/- 0.25 | Max Head Height T | Max Unthreaded Length S | Minimum Distance Centre Line Hole to Sheet Edge |
|---|---|---|---|---|---|---|---|
| M5 | 0.9 | 5.0 | 6.5 | 7.8 | 1.14 | 2.7 | 10.7 |
| M6 | 1.0 | 6.0 | 7.5 | 9.4 | 1.27 | 2.8 | 11.5 |
| M8 | 1.5 | 8.0 | 9.5 | 12.5 | 1.78 | 3.5 | 12.7 |
| M10 | 2.3 | 10.0 | 11.5 | 15.7 | 2.29 | 4.1 | 13.7 |
All dimensions in millimeters.
Thread & Length Data
| Thread Size / Code | Type | Length Code "L" +/- 0.4 (Length Code in Millimetres) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Steel | Stainless Steel | ||||||||
| M5 | P-HFH | P-HFHS | 15 | 20 | 25 | 30 | 35 | 40 | 50 |
| M6 | P-HFH | P-HFHS | 15 | 20 | 25 | 30 | 35 | 40 | 50 |
| M8 | P-HFH | P-HFHS | 15 | 20 | 25 | 30 | 35 | 40 | 50 |
| M10 | P-HFH | P-HFHS | 15 | 20 | 25 | 30 | 35 | 40 | 50 |
How to Specify PFHS/PFH Self-Clinching Stud
| P-HFH (Steel Standard Sizes) | |
|---|---|
| PRODUCT CODE | P-HFH - M6 - 20 - Z |
| THREAD CODE | P-HFH - M6 - 20 - Z |
| LENGTH CODE | P-HFH - M6 - 20 - Z |
| PLATING CODE | P-HFH - M6 - 20 - Z |
| P-HFHS (Stainless Steel Standard Sizes) | |
|---|---|
| PRODUCT CODE | P-HFHS - M6 - 20 |
| THREAD CODE | P-HFHS - M6 - 20 |
| LENGTH CODE | P-HFHS - M6 - 20 |
Technical Data
P-HFH & P-HFHS Types (Unified)
MATERIAL CODES
P-FH – Hardened Steel Zinc Plated
P-FHS – Stainless Steel
STANDARD PLATING FINISH
Zinc & Clear Trivalent Passivation (Z)
General Dimensions
| Thread Size / Code | Min Sheet Thickness | Rec Hole Size -.000 +.005 | Max. Hole in Mating Component | Head Diameter E +/- 0.010 | Max Head Height T | Max Unthreaded Length S | Minimum Distance Centre Line Hole to Sheet Edge |
|---|---|---|---|---|---|---|---|
| 032 / 024 | 0.050 | 0.190 | 0.250 | 0.300 | 0.040 | 0.105 | 0.415 |
| 0420 / 0428 | 0.060 | 0.250 | 0.312 | 0.380 | 0.050 | 0.125 | 0.460 |
| 0518 / 0524 | 0.075 | 0.312 | 0.375 | 0.480 | 0.070 | 0.140 | 0.500 |
| 0616 / 0624 | 0.090 | 0.375 | 0.437 | 0.580 | 0.085 | 0.155 | 0.530 |
All dimensions in inches.
Thread & Length Data
| Thread Size / Code | Type | Length Code "L" +/- .015 (Length Code in 16ths of an Inch) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Steel | Stainless Steel | 1/2.500 | 3/4.750 | 11.00 | 1-1/41.25 | 1-1/21.50 | 1-3/41.75 | 22.00 | |
| 032 / 024 | P-HFH | P-HFHS | 8 | 12 | 16 | 20 | 24 | 28 | 32 |
| 0420 / 0428 | P-HFH | P-HFHS | 8 | 12 | 16 | 20 | 24 | 28 | 32 |
| 0518 / 0524 | P-HFH | P-HFHS | 8 | 12 | 16 | 20 | 24 | 28 | 32 |
| 0616 / 0624 | P-HFH | P-HFHS | N/A | 12 | 16 | 20 | 24 | 28 | 32 |
All dimensions in inches.
How to Specify
Methods of Assembly
- Punch a hole in the metal sheet to the size recommended in our technical data table. De-burring of the hole is not recommended.
- Insert the stud through the hole in sheet and into the appropriate anvil as detailed below.
- Apply squeezing pressure sufficient to fully embed the teeth, bringing the head into contact with the sheet.
|
THREAD SIZE Metric | PUNCH | ANVIL | ||||
|---|---|---|---|---|---|---|
| RECESS WIDTH D mm | RECESS WIDTH F mm | MIN DIE LENGTH | BORE DIAMETER C mm | THIN SHEET | ||
| C/SINK DIA A mm | SHEET THICKNESS mm | |||||
| M5 | 8.2 - 8.4 | 0.99 - 1.04 | L | 5.1 - 5.15 | 5.8 - 5.9 | 0.90 - 1.29 |
| M6 | 9.8 - 10.0 | 1.12 - 1.17 | L | 6.1 - 6.15 | 7.0 - 7.1 | 1.00 - 1.49 |
| M8 | 12.9 - 13.1 | 1.63 - 1.68 | L | 8.1 - 8.15 | 9.0 - 9.1 | 1.50 - 1.99 |
| M10 | 16.1 - 16.3 | 2.10 - 2.12 | L | 10.1 - 10.15 | - | - |
|
THREAD SIZE Unified | PUNCH | ANVIL | ||||
|---|---|---|---|---|---|---|
| RECESS WIDTH D inch | RECESS WIDTH F inch | MIN DIE LENGTH | BORE DIAMETER C inch | THIN SHEET | ||
| C/SINK DIA A inch | SHEET THICKNESS inch | |||||
| 10 | .315 - .325 | .035 - .036 | L | .191 - .194 | .216 - .220 | .036 - .049 |
| 1/4 | .395 - .405 | .045 - .046 | L | .250 - .253 | .286 - .296 | .040 - .059 |
| 5/16 | .495 - .505 | .063 - .064 | L | .313 - .316 | .350 - .354 | .060 - .074 |
| 3/8 | .595 - .605 | .077 - .078 | L | .376 - .379 | - | - |
Note: The above values are averages when correct installation is performed. Variations in hole size, material and installation will affect these results. For specific advice we strongly recommend consultation with your PSM Technology Centre.
Find the Right P-HFH or P-HFHS Stud for Your Sheet Metal Assembly
Start browsing our products or request a quote today to find the ideal fastening solution for your application.Frequently Asked Questions About PHFH Self-Clinching Stud
What are P-HFH and P-HFHS Self-clinching Studs?
What is the difference between P-HFH and P-HFHS Studs?
Can these studs be installed flush with the sheet?
What sheet thickness and hole size are required?
Specify the material type, thread code and length code, plus the plating code for the steel version. For example, P-HFH-M6-20-Z identifies a zinc-plated steel stud with an M6 thread and a 20 mm length. P-HFHS-M6-20 identifies the stainless steel version. For unified studs, length codes are expressed in sixteenths of an inch; code 20 represents 1¼ inches.