MIL-DTL-38999 III (D38999) harsh environment connectors comprise wall mount receptacles, jam nut receptacles, and straight self-locking RFI plugs, available in 9 shell sizes and 54 insert arrangements. Featuring M39029 contacts in various sizes, including power and twinax options, they cater to diverse connectivity needs. Offered in aluminum, stainless steel, and lightweight composite shells with plating choices such as olive drab cadmium and nickel, these connectors ensure durability and performance. Compliant with RoHS standards and Boeing BACC-approved, they guarantee quality and reliability in demanding applications.