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