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PEM® Brand Fasteners for Metal Sheets and Panels
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Concealed Head Studs – Types CFHA, CFHC, CHA, CHC
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Concealed-Head Studs - Types CHA,CFHA,CHC,CFHC - Unified
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Part # CFHA-632-6
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Part # CFHA-632-6, Concealed-Head Studs - Types CHA,CFHA,CHC,CFHC - Unified
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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Specifications
Thread Size
.138-32 (#6-32)
Thread Code
632
Length Code
6
Material Code
A
Min. Sheet Thickness
.093
in
Blind Mounting Hole Diameter + .003 - .000
.213
in
Min. Depth of Blind Hole
1
.075
in
L - Length ± .015
.375
in
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A Max.
.071
in
E ± .010
.250
in
C Max.
.212
in
Min. Dist. Hole C/L to Edge
.188
in
Max. Hole in Attached Parts
.160
in
For Use in Sheet Hardness
2
HRB 50 / HB 82 or less
Thread Specification
External, ANSI B1.1, 2A
Fastener Material
Aluminum
CAD Supplier
PennEngineering® (PEM®)
1
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.
2
HRB - Hardness Rockwell “B” Scale. HB - Hardness Brinell.
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CHA_CHC_CFHA_CFHC_Installed
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