The MIL-DTL-38999 III (D38999) harsh environment connectors encompass wall mount receptacles, jam nut receptacles, and straight self-locking RFI plugs, available in 9 shell sizes and 54 insert arrangements. Featuring M39029 contacts in various sizes, including power and twinax options, these connectors are designed for rugged applications. With shell material choices like aluminum, stainless steel, and lightweight composite, and plating options such as olive drab cadmium and passivated stainless steel, they offer versatility. RoHS-compliant and Boeing BACC-approved variants are also part of the selection, ensuring compliance with industry standards. Ideal for military and aerospace use, the connectors provide reliable performance in extreme conditions.