HFH-0518-28ZC

High-Strength Studs – Type HFH/HFHS/HFHB

HFH-0518-28ZC

High-Strength Studs – Type HFH/HFHS/HFHB

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.

HFHB (heavy-duty BUSBAR®) Studs are ideal for applications which demand superior electrical/mechanical attachment points. Phosphor bronze studs offer twice the conductivity of carbon steel studs.- Types HFH and HFHS are for high-strength applications in sheets as thin as .050”.

  • Type HFHB is for superior electrical/mechanical attachment in copper.
  • Type HFH is recommended for use in steel or aluminum sheets HRB (Rockwell “B” Scale) 85 or less and HB (Hardness Brinell) 165 or less.
  • Type HFHS is recommended for use in steel or aluminum sheets HRB (Rockwell “B” Scale) 70 or less and HB (Hardness Brinell) 125 or less.
  • Type HFHB is recommended for use in copper sheets HRB (Rockwell “B” Scale) 55 or less and HB (Hardness Brinell) 83 or less.

Specifications

Thread Code
518
Thread Size
5/16-18
Thread Specification
2A, ANSI B1.1, External
Fastener Material
Carbon Steel
Optional Finish
SC1 (5µm), Type II, yellow, Zinc plated per ASTM B633
For Use in Sheet Hardness
HRB 85 / HB 165 or Less
Length Code
28
Thread Strength_ksi
120
Product Category
High-Strength Studs – Type HFH/HFHS/HFHB
CAD Supplier
PennEngineering® (PEM®)
CADPartID
103714
Application Type
Aerospace, Automotive, Automotive Electronics, Commercial Vehicles, Datacom, Electric Vehicle Chargers, Electric Vehicles, Electronics, Industrial, Manufacturing & Sheet Metal Fabrication, Medical, Telecom
Base Panel Material
Aluminum, Steel
Brand
PEM
Fastener Characteristics
Threaded External
Industry
Automotive, Automotive Electronics, Datacom & Telecom, Defense, Electric Vehicles, Industrial & Commercial, Medical
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
0.48in
Hole Size in Sheet + .005 – .000_in
0.312in
L Len Pm 015in Or 4mm
1.75in
Max. Hole in Attached Parts_in
0.375in
Min. Dist. Hole C/L to Edge_in
0.5in
Min. Sheet Thickness_in
0.075in
S Max._in
0.14in
T Max._in
0.07in

Resources

Installation & Performance Data

fh-hfh-hfhs-hfhb-studs-unified
TYPE THREAD CODE REC. NUT TIGHTENING TORQUE (ft. lbs.) TEST SHEET THICKNESS & MATERIAL SHEET HARDNESS HRB INSTALLATION (lbs.) PUSHOUT (lbs.) TORQUE-OUT (in. lbs.) TENSILE STRENGTH (lbs.)
HFH 0518 20 .091" Aluminum 39 8000 380 22 6280
HFH 0518 20 .090" Steel 58 10000 590 22 6280

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