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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 .086-56 (#2-56)

Thread Code

 N/A 256

Shank Code

 N/A 2

A (Shank) Max.

 N/A .054 in CLA-Dwg.jpg
Min. Sheet Thickness1 N/A .056 in

Hole Size in Sheet + .003 - .000

 N/A .166 in

C Max.

 N/A .165 in

E ± .010

 N/A .250 in

T ± .010

 N/A .070 in
Min. Dist. Hole C/L to Edge2 N/A .19 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.