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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
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Unit of Measure

Specifications

Thread Size

.250-20 (1/4-20)

Thread Code

0420

Length Code

3

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

.187 in a1391.jpg

A Max.

.041 in
B Max.2 .354 in

C Max.

.389 in

H Nom.

.438 in a1394.jpg

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.