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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.

FH (flush-head) studs are available in aluminum, steel, or stainless steel. They are also available unthreaded on special order.
  • Flush-head in designated minimum sheet thickness or greater.
  • Type FH is recommended for use in steel or aluminum sheets HRB (Rockwell “B” scale) 80 or less and HB (Hardness Brinell) 150 or less.
  • Type FHS is recommended for use in steel or aluminum sheets HRB (Rockwell “B” scale) 70 or less and HB (Hardness Brinell) 125 or less.
  • Type FHA is recommended for use in aluminum sheets HRB (Rockwell “B” scale) 50 or less and HB (Hardness Brinell) 82 or less.
Unit of Measure

Thread Size

N/A .086-56 (#2-56)

Thread Code

N/A 256

Length Code

N/A 10
Min. Sheet Thickness1 N/A .040 in

Hole Size in Sheet + .003 - .000

N/A .085 in

Max. Hole in Attached Parts

N/A .105 in

L - Length ± .015

N/A .625 in a1374.jpg

H ± .015

N/A .144 in
S Max.2 N/A .075 in

Min. Dist. Hole C/L to Edge

N/A .187 in

For Use in Sheet Hardness

N/A HRB 80 / HB 150 or less

Thread Specification

N/A External, ANSI B1.1, 2A

Fastener Material

N/A Heat-Treated Carbon Steel

Optional Finish

N/A Zinc plated per ASTM B633, SC1 (5µm), Type II, yellow

CAD Supplier

N/A PennEngineering® (PEM®)
  • 1 For maximum performance, we recommend that you use the maximum shank length for your sheet thickness.
  • 2 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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