D38999/24WD19SN is a jam nut receptacle connector conforming to MIL-DTL-38999 Series III specifications, designed for military and aerospace-electric applications. The connector features an aluminum shell with olive drab cadmium over electroless nickel base finish (Class W), providing corrosion resistance and durability in harsh environments. It incorporates normal polarization (keying) to ensure proper mating and prevent incorrect connections. The connector is supplied with contacts, spare contacts (one spare for inserts with 2-26 contacts, two spares for 27+ contacts), sealing plugs (minimum 10% of contact count), and insertion/extraction tools for each contact size. This connector is ideal for applications requiring reliable electrical connections in military avionics, ground support equipment, and other defense systems where environmental protection and connection integrity are critical.