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All Categories > PEM® Brand Fasteners for Metal Sheets and Panels > Studs and Pins for Sheet Metal > Heavy Duty Studs, Non Flush – Types HFH, HFHB, HFE, HFHS, THFE > Heavy Duty Studs, non Flush – Types HFH, HFHB, HFHS > High-Strength Studs - Type HFH/HFHS/HFHB - Unified > Part # HFH-0518-28ZI  

Part # HFH-0518-28ZI, High-Strength Studs - Type HFH/HFHS/HFHB - Unified

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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 Size
.313-18 (5/16-18)

Thread Code
0518

Length Code
28

Min. Sheet Thickness
.075 in

Hole Size in Sheet + .005 - .000
.312 in

Max. Hole in Attached Parts
.375 in

L - Length ± .015

 View
1.75 in

H ± .01
.480 in

S Max.1
.140 in

T Max.
.070 in

Min. Dist. Hole C/L to Edge
.500 in

Thread Strength
120 ksi

For Use in Sheet Hardness
HRB 85 / HB 165 or Less

Thread Specification
External, ANSI B1.1, 2A

Fastener Material
Heat-Treated Carbon Steel

Standard Finish
Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless

CAD Supplier
PennEngineering® (PEM®)
1 Threads are gageable to within 2 pitches of the “S” Max. dimension. A class 3B/5H maximum material commercial nut shall pass up to the “S” Max. dimension.


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·  HFH_Installed



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