MIL-DTL-38999 III (D38999) harsh environment connectors offer reliable connectivity in demanding settings. This series includes wall mount receptacles, jam nut receptacles, and straight self-locking RFI plugs, available in various shell sizes and insert arrangements. Featuring M39029 contacts in sizes 22D, 20, 16, 12, 10 power, and 8 twinax, these connectors ensure secure connections. With options in aluminum, stainless steel, and lightweight composite shells, as well as plating choices like olive drab cadmium and passivated stainless steel, they cater to diverse needs. RoHS-compliant and Boeing BACC-approved variants are also offered, making them suitable for a range of applications requiring rugged and dependable performance.