PennEngineering - Self-Clinching Nuts - Types S, SS, CLS, CLSS, SP - Unified

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

Items	S-256-0ZI Self-Clinching Nuts - Types S, SS, CLS, CLSS, SP - Unified	S-348-0ZI Self-Clinching Nuts - Types S, SS, CLS, CLSS, SP - Unified	S-440-0ZI Self-Clinching Nuts - Types S, SS, CLS, CLSS, SP - Unified	S-632-0ZI Self-Clinching Nuts - Types S, SS, CLS, CLSS, SP - Unified	S-832-0ZI Self-Clinching Nuts - Types S, SS, CLS, CLSS, SP - Unified
Description	N/A Type S, SS, CLS, and CLSS nuts provide load-bearing threads in thin sheets with high pushout and torque-out resistance. Type SP, PEM 300® nuts provide strong load-bearing threads in stainless steel sheets as thin as .030”. 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.
Thread Size	N/A .086-56 (#2-56)	N/A .099-48 (#3-48)	N/A .112-40 (#4-40)	N/A .138-32 (#6-32)	N/A .164-32 (#8-32)
Thread Code	N/A 256	N/A 348	N/A 440	N/A 632	N/A 832
Shank Code	N/A 0
A (Shank) Max.	N/A .030 in
Rec. Min. Sheet Thickness¹	N/A .030 in
Hole Size in Sheet + .003 - .000	N/A .166 in	N/A .166 in	N/A .166 in	N/A .1875 in	N/A .213 in
C Max.	N/A .165 in	N/A .165 in	N/A .165 in	N/A .187 in	N/A .212 in
E ± .010	N/A .250 in	N/A .250 in	N/A .250 in	N/A .280 in	N/A .310 in
T ± .010	N/A .070 in	N/A .070 in	N/A .070 in	N/A .070 in	N/A .090 in
Min. Dist. Hole C/L to Edge²	N/A .19 in	N/A .19 in	N/A .19 in	N/A .22 in	N/A .27 in
For Use in Sheet Hardness³	N/A HRB 80 / HB 150 or less
Thread Specification	N/A Internal, ASME B1.1, 2B
Fastener Material	N/A Heat-Treated Carbon Steel
Standard Finish	N/A Zinc plated per ASTM B633, SC1 (5µm), Type III, colorless
Optional Finish	N/A
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.