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All Categories > PEM® Brand Self-Clinching, Broaching, Surface Mount, Flare and Weld Mounted Fasteners > Standoffs for Sheet Metal > Concealed-Head Standoffs – Types CSOS, CSS > Stainless Steel Standoffs - Types CSS, CSOS - Unified > Part # CSS-440-3  
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Part # CSS-440-3, Stainless Steel Standoffs - Types CSS, CSOS - Unified

These standoffs ensure permanent mounting in metal sheets as thin as .062 in.

The fastener head is locked securely in a blind, milled hole and is able to handle substantial loads. The concealed-head feature allows the side of the sheet opposite ins


Thread Size

.112-40 (#4-40)

Thread Code


Length Code


Material Code






Min. Sheet Thickness

.062 in

Blind Mounting Hole Diameter + .003 - .000

.213 in

Min. Depth of Blind Hole1

.043 in

L - Length + .002 –.005

.187 in

A Max.

.041 in

B Max.2

.165 in

C Max.

.212 in

H Nom.

.250 in

Min. Dist. Hole C/L to Edge

.188 in

For Use in Sheet Hardness

HRB 70 / HB 125 or Less

Thread Specification

Internal, ANSI B1.1, 2B

Fastener Material

300 Series Stainless Steel

Standard Finish

Passivated and/or tested per ASTM A380

CAD Supplier

PennEngineering® (PEM®)

Min. Depth Full Thread F

.188 in
1 Blind mounting holes may be deeper than minimums except where sheet material is at or near minimum thickness. Fasteners should always be installed so the flange is flush with the surface of the sheet.
2 If standoff is used as a bushing, the hole in attached part must not exceed “B” plus .020” / 0.51 mm.


PEM Bulletin CH

PEMSERTER® Tooling Selector