The steel shell with tin plating provides EMI shielding and mechanical robustness, while the UL94 V-0 polyester housing meets flammability requirements for equipment inside enclosures.
The gold flash contact finish (phosphor bronze base) provides corrosion resistance for moderate mating cycles typical of field-serviceable equipment; for high-cycle or corrosive environments, a thicker gold plating would be preferred. The 4-40 threaded insert on the flange is the standard D-sub panel-mount hardware — confirm your mating plug and panel have matching 4-40 jackscrews or standoffs.