Item # CFHA-632-4, Concealed-Head Studs - Types CHA,CFHA,CHC,CFHC

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 ismore

Unit of Measure

Specifications

Thread Size	N/A .138-32 (#6-32)
Thread Code	N/A 632
Length Code	N/A 4
Material Code	N/A A
Min. Sheet Thickness¹	N/A .093 in
Blind Mounting Hole Diameter + .003 - .000	N/A .213 in
Min. Depth of Blind Hole²	N/A .075 in
L - Length ± .015	N/A .250 in
A Max.	N/A .071 in
E ± .010	N/A .250 in
C Max.	N/A .212 in
Min. Dist. Hole C/L to Edge	N/A .188 in
Max. Hole in Attached Parts	N/A .160 in
For Use in Sheet Hardness³	N/A HRB 50 / HB 82 or less
Thread Specification	N/A External, ANSI B1.1, 2A
Fastener Material	N/A Aluminum
CAD Supplier	N/A 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.

Specifications

Thread Size

Thread Code

Length Code

Material Code

Blind Mounting Hole Diameter + .003 - .000

L - Length ± .015

A Max.

E ± .010

C Max.

Min. Dist. Hole C/L to Edge

Max. Hole in Attached Parts

Thread Specification

Fastener Material

CAD Supplier