CONNECTOR, CIRC, 20-39, 39WAY, SIZE 20; Military Specification:MIL-DTL-38999 Series II; Circular Connector Shell Style:Jam Nut Receptacle; No. of Contacts:39Contacts; Circular Contact Type:Crimp Pin; Coupling Style:Bayonet; Insert Arrangement:20-39; Connector Body Material:Aluminium Alloy Body; Connector Body Plating:Olive Drab Chromate over Cadmium; Contact Material:Copper Alloy; Contact Plating:Gold; Insert Rotation:A; Service Class:Environmentally Sealed; Product Range:MIL-DTL-38999 Series II