MS3106F20-4S is a circular military-grade connector conforming to MIL-C-5015 specifications, featuring a straight plug shell with threaded coupling and cable clamp endbell. The connector accommodates 4 contacts (size 12) with solder cup termination and hard silver plating, providing reliable electrical connections in demanding environments. It operates over an ambient temperature range of -55°C to +125°C with an insulator resistance exceeding 1000 MO and a test voltage rating of 2500 Vrms, ensuring robust performance in harsh conditions. The connector delivers a contact rating of 41 A at +20°C with a contact resistance of 3 mO, and features an aluminum alloy shell with olive drab chromate coating over cadmium plating for corrosion resistance. With 500 minimum mating cycles, 500 hours salt spray resistance, and IP65 ingress protection, this connector is ideal for military, aerospace, and industrial applications requiring secure, weatherproof connections.