The 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. Utilizing M39029 contacts, these connectors support sizes 22D, 20, 16, 12, 10 power, and 8 twinax. With options in aluminum, stainless steel, and lightweight composite shells, along with various plating choices like olive drab cadmium and passivated stainless steel, they cater to diverse needs. Meeting RoHS compliance and Boeing BACC standards, these connectors ensure high-performance in military and industrial applications.