These standoffs ensure permanent mounting in metal sheets as thin as 1.60mm.

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.
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Unit of Measure

Thread Size x Pitch

 M3 x 0.5

Thread Code

 M3

Length Code

 20

Material Code

 S

Style

 #3

Shank

 Short
Min. Sheet Thickness1 1.6 mm

Blind Mounting Hole Diameter + 0.08

 5.41 mm
Min. Depth of Blind Hole2 1.10 mm

L - Length + 0.05 –0.13

 20 mm
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A Max.

 1.04 mm
B Max.3 4.20 mm

C Max.

 5.39 mm

H Nom.

 6.35 mm
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Min. Dist. Hole C/L to Edge

 4.8 mm

For Use in Sheet Hardness

 HRB 70 / HB 125 or Less

Thread Specification

 Internal, ANSI / ASME B1.13M, 6H

Fastener Material

 300 Series Stainless Steel

Standard Finish

 Passivated and/or tested per ASTM A380

Min. Depth Full Thread F

 5 mm

CAD Supplier

 PennEngineering® (PEM®)
  • 1 For maximum performance, we recommend that you use the maximum shank length for your sheet thickness.
  • 2 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.
  • 3 If standoff is used as a bushing, the hole in attached part must not exceed “B” plus .020” / 0.51 mm.