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 connector configurations. Utilizing M39029 contacts in various sizes, including power and twinax options, these connectors ensure reliable performance. Available in aluminum, stainless steel, and composite materials, with plating choices like olive drab cadmium and passivated stainless steel, they meet diverse environmental requirements. RoHS-compliant and Boeing BACC-approved designs cater to industry standards, guaranteeing high-quality connectivity in demanding settings.