These studs 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.
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Unit of Measure

Thread Size

 .112-40 (#4-40)

Thread Code

 440

Length Code

 4

Material Code

 A
Min. Sheet Thickness1 .062 in

Blind Mounting Hole Diameter + .003 - .000

 .172 in
Min. Depth of Blind Hole2 .043 in

L - Length ± .015

 .250 in a1395.jpg

A Max.

 .041 in

E ± .010

 .205 in

C Max.

 .171 in

Min. Dist. Hole C/L to Edge

 .156 in

Max. Hole in Attached Parts

 .135 in
For Use in Sheet Hardness3 HRB 50 / HB 82 or less

Thread Specification

 External, ANSI B1.1, 2A

Fastener Material

 Aluminum

CAD Supplier

 PennEngineering® (PEM®)
  • 1 For maximum performance, we recommend that you use the maximum shank length for your sheet thickness.
  • 2 Blind 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 HRB - Hardness Rockwell “B” Scale. HB - Hardness Brinell.