CFHA-440-4 is a concealed-head self-clinching stud designed for permanent installation in aluminum sheets as thin as 0.062 in. (1.6 mm), providing a reusable #4-40 thread and leaving the opposite sheet surface smooth. It installs using a blind hole of minimum 0.172 in. depth and requires a hole diameter of 0.138 in., with a minimum edge distance of 0.171 in. The stud is made of stainless steel and is recommended for aluminum sheets with hardness HRB 50 or HB 89 or less. Installation is performed with a standard press or PEMSERTER system.
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-440-4 | CFHA-440-4 |
| 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 |
