CSOS-M3-4 - Stainless Steel Standoffs by PennEngineering ® (PEM ® )

The PEM® CSOS-M3-4 is a high-performance concealed-head self-clinching standoff engineered to provide permanent metric internal threads for component mounting or spacing in thin metal sheets. Fabricated from rugged 300 Series Stainless Steel, this metric-threaded fastener delivers exceptional physical durability and corrosion protection, making it an ideal choice for high-reliability medical electronics, aerospace enclosures, and marine instrumentation. Because the hardware integrates into a blind, milled hole, the side of the host panel opposite the installation remains completely smooth and unmarred. When installed using standard parallel squeezing equipment, the displaced sheet material cold-flows seamlessly around the standoff's head into its precision undercut, providing outstanding load capacity while ensuring a completely clean exterior aesthetic.

Concealed-Head Design installs directly into a blind, milled hole to ensure the exterior face of the sheet opposite the installation remains completely smooth and unmarked.

Environmental Ingress Protection secures internal electronics by keeping the external panel face unpierced and fully sealed against liquid, dust, air, and gases.

300 Series Stainless Steel Construction provides strong structural integrity paired with reliable, long-lasting defense against localized atmospheric corrosion.

High Load-Bearing Capacity creates an unyielding mechanical joint as displaced host metal wraps tightly around the fastener head inside the undercut.