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PennEngineering
All Categories > PEM® Brand Fasteners for Metal Sheets and Panels > Studs and Pins for Sheet Metal > Concealed Head Studs – Types CFHA, CFHC, CHA, CHC > Concealed-Head Studs - Types CHA,CFHA,CHC,CFHC - Unified > Part # CHA-440-4  

Part # CHA-440-4, Concealed-Head Studs - Types CHA,CFHA,CHC,CFHC - Unified

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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.




 Specifications   

Thread Size
.112-40 (#4-40)

Thread Code
440

Length Code
4

Material Code
A

Min. Sheet Thickness
.062 in

Blind Mounting Hole Diameter + .003 - .000
.172 in

Min. Depth of Blind Hole1
.043 in

L - Length ± .015

 View
.250 in

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 Hardness2
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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