The MIL-DTL-38999 III (D38999) 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, they offer versatility in connectivity solutions. Utilizing M39029 contacts in various sizes, including power and twinax configurations, these connectors ensure reliable performance. Available in aluminum, stainless steel, and lightweight composite shells, with plating options such as olive drab cadmium and passivated stainless steel, they meet diverse requirements. RoHS-compliant and Boeing BACC-approved designs cater to industry standards, making them ideal for demanding environments.