CFHA-M3-20 is a concealed-head self-clinching stud designed for permanent installation in aluminum or steel sheets as thin as 1.6 mm, providing a reusable M3 thread. It installs using a standard press into a blind hole with a minimum depth of 20 mm and requires a hole diameter of 4.37 mm. The stud retains a smooth, unmarred surface on the side opposite installation and meets ingress protection requirements. The CFHA type is recommended for aluminum sheets with hardness HRB 50 or HB 89 or less. Installation is achieved with a hollow anvil and solid punch.
These studs ensure permanent mounting in metal sheets as thin as 1.60mm.
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-M3-20 | CFHA-M3-20 |
| Product Name | Concealed-Head Studs - Types CHA,CFHA,CHC,CFHC - Metric | Concealed Head Studs |
| Attachment | Pressed | Threaded |
| Shape | Round | |
| Design Units | Metric | Metric |
| Metric | M3 | M3; M3 x 0.5 |
