Item # S-M121ZC, Self-Clinching Nuts - Types S, SS, CLS, CLSS, SP

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Self-clinching nuts are installed by placing them in properly sized holes in sheets and applying a parallel squeezing force to the head of the nut. The sheet metal surrounding the head cold flows into an undercut thereby making the fastener an integral part of the sheet. A serrated clinching ring prevents the fastener from rotating after installation.

Provide load-bearing threads in thin sheets with high pushout and torque-out resistance.

Type CLA is recommended for use in steel or aluminum sheets HRB (Rockwell "B" scale) 50 or less and HB (Hardness Brinell) 82 or less.

Types CLS / CLSS are recommended for use in steel or aluminum sheets HRB (Rockwell "B" scale) 70 or less and HB (Hardness Brinell) 125 or less.

Types S / SS are recommended for use in steel or aluminum sheets HRB (Rockwell "B" scale) 80 or less and HB (Hardness Brinell) 150 or less.

Type SP is recommended for use in stainless steel sheets HRB (Rockwell "B" scale) 90 or less and HB (Hardness Brinell) 185 or less.

Unit of Measure

Specifications

Thread Size x Pitch	N/A M12 x 1.75
Thread Code	N/A M12
Shank Code	N/A 1
A (Shank) Max.	N/A 3.05 mm
Rec. Min. Sheet Thickness¹	N/A 3.18 mm
Hole Size in Sheet + 0.08	N/A 17 mm
C Max.	N/A 16.95 mm
E ± 0.25	N/A 20.57 mm
T ± 0.25	N/A 8.50 mm
Min. Dist. Hole C/L to Edge²	N/A 16 mm
For Use in Sheet Hardness³	N/A HRB 80 / HB 150 or less
Thread Specification	N/A Internal, ASME B1.13M, 6H
Fastener Material	N/A Heat-Treated Carbon Steel
Optional Finish	N/A Zinc plated per ASTM B633, SC1 (5µm), Type II, yellow
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.

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Thread Size x Pitch

Thread Code

Shank Code

A (Shank) Max.

Hole Size in Sheet + 0.08

C Max.

E ± 0.25

T ± 0.25

Thread Specification

Fastener Material

Optional Finish

CAD Supplier

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