CFHC-440-4 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 #4-40 threads while leaving the opposite sheet surface smooth and unmarred. It requires a blind hole of 0.112 in. diameter and a minimum mounting depth of 0.043 in. The stud is made of 300 series stainless steel with a passivated finish and is recommended for use in materials with hardness up to HRB 70 / HB 125. Installation is performed using a PEMSERTER® press or equivalent with a hollow anvil and solid punch, ensuring the flange is flush with the sheet surface. It meets NAS63540/4 specifications when ordered under the appropriate part number. The fastener is compatible with standard tooling such as PEMSERTER® part number 975200048 and HAEGER® part number H-108-0020L.
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 | CFHC-440-4 | CFHC-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 |
