• Enlarged head diameter reduces stress on panel.
  • Thicker head allows for larger hole in attached panels.
  • Clinch design provides high-strength in sheets as thin as .031”.
  • Recommended for use in steel or aluminum sheets HRB (Rockwell “B” Scale) 85 or less and HB (Hardness Brinell) 165 or less.
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Unit of Measure

Thread Size

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

Thread Code

 N/A 0420

Length Code

 N/A 16
Min. Sheet Thickness1 N/A .031 in

Hole Size in Sheet + .005 - .000

 N/A .250 in

L - Length ± .015

 N/A 1.00 in Heavy-Duty-Studs-for-Thin-Sheets---Type-THFE-2.jpg

H ± .01

 N/A .462 in
S Max.2 N/A .109 in

T Max.

 N/A .069 in

Max. Hole in Attached Parts

 N/A .340 in

Min. Dist. Hole C/L to Edge

 N/A .446 in

Thread Strength

 N/A 120 ksi

For Use in Sheet Hardness

 N/A HRB 85 / HB 165 or Less

Thread Specification

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

Fastener Material

 N/A Hardened Carbon Steel

Standard Finish

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

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.