CFHC-M4-8 is a concealed-head self-clinching stud designed for permanent installation in steel or aluminum sheets as thin as 1.6 mm, providing a threaded M4 x 0.7 receptacle. It features a flush-mounted, unmarred back side, enabling compliance with strict ingress protection requirements. Installation requires a blind hole with a minimum diameter of 4.03 mm and depth sufficient to accommodate the shank, using a HAEGER® or PEMSERTER® press. The stud is made of stainless steel, passivated per ASTM A380, and is rated for use in materials with hardness up to HRB 70 / HB 125. Torque capacity is 2 N·m in cold-rolled steel and 2.22 kN in 5052-H34 aluminum. The part meets NAS63540/4 specifications when ordered under that designation.
These studs ensure permanent mounting in metal sheets as thin as 1.60mm.
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-M4-8 | CFHC-M4-8 |
| Product Name | Concealed-Head Studs - Types CHA,CFHA,CHC,CFHC - Metric | Concealed Head Studs |
| Attachment | Pressed | Threaded |
| Shape | Round | |
| Design Units | Metric | Metric |
| Metric | M4 | M4; M4 x 0.7 |
