CHA-M4-16 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 M4 x 0.7 thread. It installs flush using a standard press and leaves the opposite sheet surface smooth and unmarred, supporting strict ingress protection requirements. The stud requires a blind hole with a diameter of 7.37 mm and a minimum depth of 5.6 mm, with a minimum distance of 4.6 mm from the hole center to the sheet edge. It is recommended for use in materials with hardness up to HRB 70 / HB 125. The fastener incorporates the PEM® dimple trademark and is part of the CHA series, which shares the concealed-head design and installation profile with related variants.
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 | CHA-M4-16 | CHA-M4-16 |
| 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 |
