MIL-DTL-38999 III (D38999) harsh environment connectors feature wall mount receptacles, jam nut receptacles, and straight self-locking RFI plugs in 9 shell sizes and 54 insert arrangements. Utilizing M39029 contacts, they accommodate sizes 22D, 20, 16, 12, 10 power, and 8 twinax. Available in aluminum, stainless steel, and lightweight composite shells with various plating options including olive drab cadmium and nickel, these connectors offer versatility. With RoHS-compliant and Boeing BACC-approved designs, they ensure quality and compliance. The 38999 Series 3 connectors, with a shell size of 13 and contact size 16(4), feature removable crimp contacts with gold plating for enhanced conductivity. Suitable for rugged environments, they have a wide operating temperature range from -65°C to 175°C and a service rating of I, making them ideal for military and aerospace applications.