CHA-M4-8 is a concealed-head self-clinching stud for metric threads, designed for permanent installation in aluminum or steel sheets as thin as 1.6 mm. It features an M4 x 0.7 thread and a shank length of 8 mm, with a minimum blind hole depth of 7.37 mm and a hole diameter of 4.6 mm. The stud installs using standard press equipment and leaves the opposite sheet surface smooth, supporting ingress protection requirements. The CHA series is recommended for aluminum sheets with hardness HRB 50 or HB 89 or less. The fastener is installed flush with the sheet surface and allows for reusable threading.
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 | CHA-M4-8 | CHA-M4-8 |
| Product Name | Concealed-Head Studs - Types CHA,CFHA,CHC,CFHC - Metric | Concealed Head Studs |
| Attachment | Pressed | Threaded |
| Shape | Round | |
| Design Units | Metric | Metric |
| Metric | M4 | M4; M4 x 0.7 |
