BSO-3.5M3-18ZI - Blind Threaded Standoffs by PennEngineering ® (PEM ® )

The PEM® BSO-3.5M3-18ZI is a self-clinching blind threaded standoff designed to stack or space components while providing a permanent attachment in thin metal sheets. Featuring a closed-end (blind) design, the outer end of the standoff is solid, creating a barrier against contaminants and protecting internal threads from debris. This design also prevents screws from penetrating through the fastener, ensuring protection for delicate internal components. It is installed by being squeezed into a round hole using a standard press, which causes the host material to cold-flow into an undercut for high pushout and torque-out resistance. Once installed, the standoff remains flush with the mounting sheet, maintaining a clean external profile without the need for secondary welding or tapping.

Closed-End Design: Provides an environmental seal and protects internal circuitry by preventing screw over-insertion and debris ingress.

Permanent Self-Clinching: Becomes an integral part of the assembly, eliminating the risk of loose hardware falling into sensitive electronics.

Flush Installation: The head of the standoff installs flush with the mounting sheet for a smooth, professional exterior finish.

High Strength: Manufactured from heat-treated carbon steel to provide reliable performance in steel or aluminum sheets.

Metric Spacing: Engineered to provide a consistent 18 mm distance between components for accurate board stacking.