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All Categories > PEM® Brand Fasteners for Metal Sheets and Panels > Standoffs for Sheet Metal > Concealed-Head Standoffs – Types CSOS, CSS > Stainless Steel Standoffs - Types CSS, CSOS - Unified > Part # CSS-0420-4  

Part # CSS-0420-4, Stainless Steel Standoffs - Types CSS, CSOS - Unified

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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 installation to remain smooth.

Sheet preparation only requires a milled blind hole to the recommended minimum depth. Center-cutting end mills for hole preparation are available from PennEngineering. Installation of the concealed-head studs and standoffs is simple using a hollow anvil and solid punch. Place the head of the fastener in the hole and insert using any standard press. Displaced sheet metal flows smoothly around the head into the undercut.




 Specifications   

Thread Size
.250-20 (1/4-20)

Thread Code
0420

Length Code
4

Material Code
S

Style
#1

Shank
Short

Min. Sheet Thickness
.062 in

Blind Mounting Hole Diameter + .003 - .000
.390 in

Min. Depth of Blind Hole1
.043 in

L - Length + .002 –.005

 View
.250 in

A Max.
.041 in

B Max.2
.354 in

C Max.
.389 in

H Nom.
.438 in

Min. Dist. Hole C/L to Edge
.375 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
.375 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.


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·  CSS_CSOS_Installed



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