CHC-440-6 is a concealed-head self-clinching stud for aluminum sheets, designed to install permanently in sheets as thin as 0.062 in (1.6 mm) and provide a reusable #4-40 thread. The fastener allows the back side of the sheet to remain smooth and unmarred, supporting ingress protection requirements. It requires a blind hole with a minimum diameter of 0.172 in and a minimum depth of 0.171 in for installation using a standard press. The stud is recommended for use in aluminum with hardness HRB 50 / HB 89 or less.
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.
| PennEngineering® | bisco industries | |
|---|---|---|
| Product Category | Studs | Studs |
| Product Number | CHC-440-6 | CHC-440-6 |
| Product Name | Concealed-Head Studs - Types CHA,CFHA,CHC,CFHC - Unified | Concealed Head Studs |
| Attachment | Pressed | Threaded |
| Shape | Round | |
| Design Units | English | English |
| Inch | # 4 | # 4 |
