Type SL self-locking nuts are designed with a unique and economical TRI-DENT® locking feature, which meets demanding locking performance requirements.
  • 3 cycle locking performance. Achieved using steel socket head cap screws, 180 ksi / property
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Unit of Measure

Thread Size

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

Thread Code

 N/A 0420

Shank Code

 N/A 1

A (Shank) Max.

 N/A .054 in a1385.jpg
Min. Sheet Thickness1 N/A .056 in

Hole Size in Sheet + .003 - .000

 N/A .344 in

C Max.

 N/A .343 in

E ± .010

 N/A .440 in

T ± .010

 N/A .170 in

Min. Dist. Hole C/L to Edge

 N/A .34 in

For Use in Sheet Hardness

 N/A HRB 80 / HB 150 or Less

Thread Specification

 N/A Internal, ASME B1.1, 2B

Fastener Material

 N/A Heat-Treated 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.