MIL-DTL-38999/20 (D38999) Series III harsh environment connectors are designed for rugged applications, featuring wall mount receptacles, jam nut receptacles, and straight self-locking RFI plugs. With 9 shell sizes and 54 insert arrangements available, these connectors offer versatility for various systems. Utilizing M39029 contacts in sizes 22D, 20, 16, 12, 10 power, and 8 twinax, they ensure reliable electrical connections. Constructed from durable materials such as aluminum, stainless steel, and lightweight composite, with a range of plating options including olive drab cadmium and nickel, these connectors are built to withstand demanding conditions. Suitable for military and aerospace use, the MIL-DTL-38999/20 connectors are RoHS compliant and Boeing BACC approved, guaranteeing high performance and reliability in mission-critical environments.