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Online literature contains the most current information available.
Type CLA aluminum nuts are recommended for use in aluminum sheet with a hardness of HRB 50 or less on the Rockwell “B” scale.

Unplated threads are sized to accept a basic go gauge after .00025” plating.
Unit of Measure

Thread Size

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

Thread Code

N/A 0420

Shank Code

N/A 3

A (Shank) Max.

N/A .120 in a1383.jpg
Min. Sheet Thickness1 N/A .125 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 Edge2 N/A .34 in
For Use in Sheet Hardness3 N/A HRB 50 / HB 82 or Less

Thread Specification

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

Fastener Material

N/A Aluminum

Standard Finish

N/A None

CAD Supplier

N/A PennEngineering® (PEM®)
  • 1 For maximum performance, we recommend that you use the maximum shank length for your sheet thickness.
  • 2 To minimize sheet distortion and maximize product performance, use a centerline-to-edge value greater or equal to the value specified.
  • 3 HRB - Hardness Rockwell “B” Scale. HB - Hardness Brinell.