CIRCULAR CONNECTOR, RCPT, 21-39, PANEL; Military Specification:MIL-DTL-38999 Series III; Circular Connector Shell Style:Jam Nut 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:Black Zinc Nickel; Contact Material:Copper Alloy; Contact Plating:Gold; Insert Rotation:C; Service Class:General Duty; Product Range:MIL-DTL-38999 Series III