The MIL-DTL-38999 III (D38999) harsh environment connectors comprise wall mount receptacles, jam nut receptacles, and straight self-locking RFI plugs, offering versatility in connectivity solutions. Available in 9 shell sizes and 54 insert arrangements, they accommodate M39029 contacts ranging from sizes 22D to 8 twinax. With shell materials including aluminum, stainless steel, and lightweight composite, and plating options like olive drab cadmium, nickel, and passivated stainless steel, these connectors meet a range of requirements. RoHS-compliant and Boeing BACC-approved designs ensure quality and compliance, making them ideal for demanding applications in aerospace, defense, and industrial sectors.