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Online literature contains the most current information available.
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.
Unit of Measure

Thread Size

N/A .112-40 (#4-40)

Thread Code

N/A 440

Length Code

N/A 8

Material Code



N/A #3


N/A Short

Min. Sheet Thickness

N/A .062 in

Blind Mounting Hole Diameter + .003 - .000

N/A .213 in
Min. Depth of Blind Hole1 N/A .043 in

L - Length + .002 –.005

N/A .500 in a1391.jpg

A Max.

N/A .041 in
B Max.2 N/A .165 in

C Max.

N/A .212 in

H Nom.

N/A .250 in a1394.jpg

Min. Dist. Hole C/L to Edge

N/A .188 in

For Use in Sheet Hardness

N/A HRB 70 / HB 125 or Less

Thread Specification

N/A Internal, ANSI B1.1, 2B

Fastener Material

N/A 300 Series Stainless Steel

Standard Finish

N/A Passivated and/or tested per ASTM A380

CAD Supplier

N/A PennEngineering® (PEM®)

Min. Depth Full Thread F

N/A .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.