The CHA-440-10 is a concealed-head self-clinching stud for permanent installation in aluminum or steel sheets as thin as 0.062 in. (1.6 mm), providing a #4-40 thread and a shank length of 0.250 in. The stud installs using a standard press and leaves the opposite side of the sheet smooth and unmarred. It is designed for use in aluminum sheets with hardness HRB 50 or less, requiring a blind hole of 0.172 in. diameter with a minimum depth of 0.171 in. The part meets NAS63540/4 specifications when ordered under that designation.
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 | CHA-440-10 | CHA-440-10 |
| 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 |
