Type SMPP self-clinching nuts are for installation into ultra-thin sheets.
  • Installs into stainless steel sheets as thin as .025”.
  • Corrosion resistance similar to 300 series stainless steel.
  • Reduced outer dimensions and thinner sheet capabilities compared to type SP thread sizes.
  • Recommended for use in stainless steel sheets HRB 90 / HB 192 or less.
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Unit of Measure

Thread Size

 .112-40 (#4-40)

Thread Code

 440

A (Shank) Max.

 .024 in
Self-Clinching-Nuts---Types-S--SS--CLS--CLSS--SP-2.png
Rec. Min. Sheet Thickness1 .025 in

Hole Size in Sheet + .003 - .000

 .166 in

C Max.

 .165 in

E ± .010

 .220 in

T ± .010

 .065 in
Min. Dist. Hole C/L to Edge2 .20 in
For Use in Sheet Hardness3 HRB 90 / HB 192 or Less

Thread Specification

 Internal, ASME B1.1, 2B

Fastener Material

 Age hardened A286 Stainless Steel (non-magnetic)

Standard Finish

 Passivated and/or tested per ASTM A380

CAD Supplier

 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.