CFHA-M4-20 is a concealed-head self-clinching stud designed for permanent installation in steel or aluminum sheets as thin as 1.6 mm, providing a reusable M4x0.7 thread. It has a shank length of 20 mm and is intended for use in aluminum sheets with hardness HRB 50 / HB 89 or less. The stud installs using a blind milled hole and leaves the opposite sheet surface smooth and unmarred, supporting ingress protection requirements. Installation requires a standard press and a hole diameter of 7.37 mm with a minimum depth of 7.37 mm. The product is certified to meet NAS63540/4 specifications when ordered with the appropriate part number. The fastener design ensures flush mounting with the sheet surface and does not require tools beyond standard press equipment.
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 | CFHA-M4-20 | CFHA-M4-20 |
| 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 |
