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Online literature contains the most current information available.
  • Installs into thinner, harder, high strength steel materials (high strength steel sheets up to 700 MPa maximum ultimate tensile)
  • Allows overall weight reduction for all vehicles
  • Provides lower installed cost
Compare to other thin sheet fastening devices:
  • Addresses environmental concerns
  • Lighter weight
  • Close to edge of panel mounting
  • No embossing required
  • Hardened stud material provides stronger thread strength
  • Can be installed automatically using press or in-die technology
Unit of Measure

Thread Size

N/A .250-20 (1/4-20)

Thread Code

N/A 0420

Length Code

N/A 8

Min. Sheet Thickness

N/A .040 in

Hole Size in Sheet + .005 - .000

N/A .250 in

L - Length ± .015

N/A .500 in Type-HFL-Hard-Panel-Studs_2.jpg

H ± .01

N/A .462 in
S Max.1 N/A .118 in

T Max.

N/A .060 in

Max. Hole in Attached Parts

N/A .340 in

Min. Dist. Hole C/L to Edge

N/A .470 in

Tensile strength

N/A 120 ksi
For Use in Sheet Hardness2 N/A HRB 96 / HB 216 or Less

Thread Specification

N/A External, ASME B1.1, 2A / ASME B1.13M, 6g

Fastener Material

N/A Heat-Treated Alloy Steel

Standard Finish

N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless

CAD Supplier

N/A 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.
  • 2 HRB - Hardness Rockwell "B" Scale. HB - Hardness Brinell