CFHC-440-6 concealed-head self-clinching studs are designed for permanent installation in steel or aluminum sheets as thin as 0.062 in. (1.6 mm), providing reusable #4-40 threads while leaving the opposite sheet surface smooth and unmarred. They require a blind hole with a minimum diameter of 0.172 in. and a minimum depth of 0.156 in., and are installed using a press with the specified anvil and punch tooling. These studs are made from stainless steel, are passivated, and are recommended for sheets with hardness up to HRB 70 / HB 125. Installation conforms to NAS63540/4 specifications when ordered by the full designation.
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 | CFHC-440-6 | CFHC-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 |
