CHC-832-8 is a concealed-head self-clinching stud designed for permanent installation in steel or aluminum sheets as thin as 0.062 in. (1.6 mm), providing reusable #8-32 threads. It requires a blind hole of 0.172 in. diameter and a minimum mounting depth of 0.290 in., with a minimum distance of 0.135 in. from the hole to the sheet edge. The stud accommodates sheet materials with a hardness of HRB 70 or HB 125 or less. Installation is accomplished using a standard press with a hollow anvil and solid punch, leaving the opposite side of the sheet smooth and unmarred. The fastener meets NAS63540/4 specifications when ordered under that designation. Torque capacity for #8-32 thread in cold-rolled steel is 18 in-lbf, with an installation pull-out force of 4,800 lbf. The product preserves full ingress protection when installed in sealed assemblies.
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 | CHC-832-8 | CHC-832-8 |
| Product Name | Concealed-Head Studs - Types CHA,CFHA,CHC,CFHC - Unified | Concealed Head Studs |
| Attachment | Pressed | Threaded |
| Shape | Round | |
| Design Units | English | English |
| Inch | # 8 | # 8 |
