CHC-M4-8 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 M4 x 0.7 external thread. It installs using a standard press into a blind hole with a minimum diameter of 4.37 mm and minimum depth of 7.37 mm, leaving the opposite sheet surface smooth. The stud is intended for use in materials with hardness up to HRB 70 / HB 125. Installation requires no access to the back side of the sheet and satisfies ingress protection requirements by maintaining a sealed interface. The part is identified by the PEM™ "two groove" trademark on standoffs, and a dimple on studs, with cosmetic variations having no impact on function.
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 | CHC-M4-8 | CHC-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 |
