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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.

HFE (heavy-duty) Studs are designed with an enlarged head diametermore
Unit of Measure

Thread Size

.313-18 (5/16-18)

Thread Code

0518

Length Code

28

Min. Sheet Thickness

.060 in

Hole Size in Sheet + .005 - .000

.312 in

L - Length ± .015

1.75 in
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H ± .01

.586 in
S Max.1 .133 in

T Max.

.083 in

Max. Hole in Attached Parts

.402 in

Min. Dist. Hole C/L to Edge

.560 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.