CHC-440-4 is a concealed-head self-clinching stud for aluminum or steel sheets as thin as 0.062 in. (1.6 mm), providing a #4-40 thread and permanent, flush mounting with a smooth rear surface. It requires a blind hole of 0.172 in. diameter and a minimum mounting depth of 0.135 in., with a minimum distance of 0.156 in. from the hole center to the sheet edge. The stud is designed for use in materials with hardness up to HRB 70 / HB 125, and installs via standard press equipment using a hollow anvil and solid punch.
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-440-4 | CHC-440-4 |
| 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 |
