The MS3126F20-16S is a miniature cylindrical straight plug connector designed for high-reliability and environmentally sealed applications, meeting MIL-C-26482, Series 1 standards. It features a shell size of 20 with an insert arrangement for 16 size-16 socket contacts, which are crimp-style, rear-insertable, and front-releasable. This connector is designated as Service Class F, incorporating an environmental grommet seal with a strain relief clamp for enhanced wire bundle support. Positive mating is ensured by a 3-point bayonet coupling and 5 key/keyway polarization. It is ideal for use in military, aerospace, and demanding industrial environments such as instrumentation and communications equipment.