CHC-440-12 is a concealed-head self-clinching stud designed for permanent installation in steel or aluminum sheets as thin as 0.062 in. It features a #4-40 thread and a shank length of 0.12 in., with a minimum blind hole diameter of 0.172 in. and a minimum mounting depth of 0.135 in. The stud is made of stainless steel and is recommended for use in materials with a hardness of HRB 70 / HB 125 or less. Installation requires a blind milled hole and a standard press, leaving the opposite sheet surface smooth and unmarred. The concealed-head design supports strict ingress protection requirements by maintaining a sealed surface.
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-440-12 | CHC-440-12 |
| 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 |
