CIRCULAR CONNECTOR, RECPT., 21-39, PIN; Military Specification:MIL-DTL-38999 Series III; Circular Connector Shell Style:Wall Mount Receptacle; No. of Contacts:39Contacts; Circular Contact Type:Crimp Pin - Contacts Not Supplied; Coupling Style:Threaded; Insert Arrangement:21-39; Connector Body Material:Aluminium Alloy Body; Connector Body Plating:Olive Drab Chromate over Cadmium; Contact Material:Copper Alloy; Contact Plating:Gold; Insert Rotation:N; Service Class:Corrosion Resistant, EMI; Product Range:MIL-DTL-38999 Series III