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All Categories > PEM® Brand Self-Clinching, Broaching, Surface Mount, Flare and Weld Mounted Fasteners > Studs and Pins for Sheet Metal > Concealed Head Studs – Types CFHA, CFHC, CHA, CHC > Concealed-Head Studs - Types CHA,CFHA,CHC,CFHC - Unified > Part # CHC-440-4  
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Part # CHC-440-4, 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.


Concealed head studs- CFHA, CFHC, CHA, CHC

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Concealed-Head Studs - Types CHA,CFHA,CHC,CFHC 2

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 Specifications  

Thread Size

.112-40 (#4-40)

Thread Code

440

Length Code

4

Material Code

C

Min. Sheet Thickness

.062 in

Blind Mounting Hole Diameter + .003 - .000

.172 in

Min. Depth of Blind Hole1

.043 in

L - Length ± .015

.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 70 / HB 125 or Less

Thread Specification

External, ANSI B1.1, 2A

Fastener Material

300 Series Stainless Steel

Standard Finish

Passivated and/or tested per ASTM A380

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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