CFHA-440-12 is a concealed-head self-clinching stud designed for permanent installation in aluminum or steel sheets as thin as 0.062 in. (1.6 mm), providing a reusable #4-40 thread while preserving a smooth, unmarred surface on the opposite side of the sheet. It is installed using a press with a blind milled hole, and is recommended for aluminum sheets with hardness HRB 50 or less. The stud features a clinching profile that secures it flush with the sheet surface and meets NAS63540/4 specifications when ordered under the appropriate part number. The part is part of the PEM® concealed-head stud series, identifiable by the PEM® dimple trademark.
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 | CFHA-440-12 | CFHA-440-12 |
| 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 |
