HFG8-0420-12ZI

High-Tensile Strength Studs – Types HFG8™, HF109™

HFG8-0420-12ZI

High-Tensile Strength Studs – Types HFG8™, HF109™

PEM® self-clinching studs are installed by placing them in properly sized holes in the sheets and squeezing into place with any standard press. The squeezing action embeds the head of the stud into the sheet. The metal displaced by the head flows smoothly and evenly around the ribs and into the annular groove – creating a flushhead assembly and securely locking the stud into the sheet with high torque-out and pushout resistances.

HFH (heavy-duty) Studs replace weld studs with easier installation at lower costs. The large stud head which projects above the sheet material distributes the axial tightening force over a large area thereby improving pull through resistance.

HFG8 and HF109 (heavy-duty high tensile strength) Studs are manufactured for the most demanding applications from medium carbon alloy steel, then heat-treated to high strength and hardness qualities.- Types HFG8 and HF109 are for heavy-duty applications in sheets as thin as .040”.

  • Grade 8 and property class 10.9 studs meeting 150 ksi/1040 MPa minimum.
  • Recommended for use in steel or HSLA steel sheets HRB (Rockwell “B” Scale) 89 or less and HB (Hardness Brinell) 180 or less.
  • Large head diameter spreads compressive stress on panel.

To be sure that you are getting genuine PEM products, look for the PEM stamp. Studs within the size range of the SAE and ISO specs are also identified with the Grade 8 and 10.9 head markings respectively.

Thread size #10-32 does not have SAE head marking since it is technically not within the size range of the specification.

Specifications

Thread Code
420
Thread Size
1/4-20
Thread Specification
2A, ANSI B1.1, External
Fastener Material
Alloy Steel
Standard Finish
Zinc plus Clear Chromate
For Use in Sheet Hardness
HRB 89 / HB 180 or Less
Length Code
12
Product Category
High-Tensile Strength Studs – Types HFG8™, HF109™
CAD Supplier
PennEngineering® (PEM®)
CADPartID
103710
Application Type
Automotive, Commercial Vehicles, Electric Vehicles
Base Panel Material
Hard Steel, Steel
Brand
PEM
Fastener Characteristics
Threaded External
Industry
Automotive, Electric Vehicles, Industrial & Commercial
Installation Equipment/Method
C-Frame Automatic Feed, C-Frame Manual Feed, In-Die
PEM Product Family
FH
Product Type
Studs
Technology Type
Self-Clinching
Unit (Metric/Unified)
Unified
H ± .01_in
0.507in
Hole Size in Sheet + .005 – .000_in
0.25in
L Len Pm 015in Or 4mm
0.75in
Max. Hole in Attached Parts_in
0.34in
Min. Dist. Hole C/L to Edge_in
0.709in
Min. Sheet Thickness_in
0.04in
S Max._in
0.125in
T Max._in
0.09in

Resources

Installation & Performance Data

fh-hfg8-hf109-studs-unified
TYPE THREAD CODE REC. NUT TIGHTENING TORQUE (ft. lbs.) TENSILE STRENTH (lbs.) TEST SHEET THICKNESS & MATERIAL SHEET HARDNESS HRB INSTALLATION (lbs.) PUSHOUT (lbs.) TORQUE-OUT (ft. lbs.)
HFG8 0420 13 4750 .047" HSLA Steel 85.7 21400 592 11.5
HFG8 0420 13 4750 0.040" Cold-rolled Steel 45.0 14100 248 11.5

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