CSOS-440-4 - Stainless Steel Standoffs by PennEngineering ® (PEM ® )

The PEM® CSOS-440-4 is a precision-engineered concealed-head self-clinching standoff designed to establish robust, permanent internal threads in thin metal sheets. Formed from high-grade 300 Series Stainless Steel, this unified-threaded fastener delivers exceptional physical durability and corrosion protection, making it an ideal choice for high-end electronic enclosures, medical equipment, and aerospace assemblies. Because the fastener head locks securely into a blind, milled hole, the side of the host sheet opposite the installation remains completely smooth and unmarred. When integrated using standard parallel pressing equipment, the host sheet material cold-flows seamlessly around the standoff's head into its undercut, providing immense 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 stays 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.