CONNECTOR CIRC 20-4 4WAY SIZE 20; Military Specification:MIL-DTL-5015 Series; Circular Connector Shell Style:Box Mount Receptacle; No. of Contacts:4Contacts; Circular Contact Type:Solder Socket; Coupling Style:Threaded; Insert Arrangement:20-4; Connector Body Material:Aluminium Alloy Body; Connector Body Plating:Olive Drab Chromate over Cadmium; Contact Material:Brass Copper Alloy; Contact Plating:Silver; Insert Rotation:W; Service Class:Environmentally Sealed; Product Range:MIL-DTL-5015 Series