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Tel 800.466.1940
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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
Unit of Measure

Thread Size

 .250-20 (1/4-20)

Thread Code

 0420
Shank Code1 1

A (Shank) Max.

 .054 in
a1385_1.jpg

Min. Sheet Thickness

 .056 in

Hole Size in Sheet + .003 - .000

 .344 in

C Max.

 .343 in

E ± .010

 .440 in

T ± .010

 .170 in
Min. Dist. Hole C/L to Edge2 .34 in

For Use in Sheet Hardness

 HRB 80 / HB 150 or less

Thread Specification

 Internal, ASME B1.1, 2B

Fastener Material

 Heat-Treated Carbon Steel

Standard Finish

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

CAD Supplier

 PennEngineering® (PEM®)

Inventory
  • 1 Other shank and screw lengths available.
  • 2 To minimize sheet distortion and maximize product performance, use a centerline-to-edge value greater or equal to the value specified.