CSOS-M4-4 is a stainless steel concealed-head self-clinching standoff designed for permanent installation in metal sheets as thin as 1.6 mm, providing internally threaded holes compatible with M4 threads. It installs using a blind milled hole and requires a HAEGER® or PEMSERTER® press with specific tooling: H-109-4-M3L anvil and 970200016300 anvil part number. The fastener ensures a smooth, unmarred back side after installation, satisfying ingress protection requirements. The product meets ASME B1.13M, 6g external and ASME B1.13M, 6H internal thread standards with passivated finish for use in aluminum or steel sheets up to HRB 70 / HB 125 hardness. Installation requires a minimum sheet thickness of 1.6 mm and a blind hole diameter of 4.03 mm. The part is part of the CSS/CSOS series, which uses M4 thread sizes with a shank length of 7.37 mm. The product carries the PEM® 'two groove' trademark on standoffs.
These standoffs 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.
Stainless Steel Standoffs
| PennEngineering® | bisco industries | |
|---|---|---|
| Product Category | Posts, Spacers, and Standoffs | Posts, Spacers, and Standoffs |
| Product Number | CSOS-M4-4 | CSOS-M4-4 |
| Product Name | Stainless Steel Standoffs - Types CSS, CSOS - Metric | Stainless Steel Standoffs |
| Type & Shape | Standoff; Round | Standoff |
