MIL-DTL-38999/24 (D38999) Series III connectors are designed for harsh environments, featuring wall mount receptacles, jam nut receptacles, and straight self-locking RFI plugs. Available in 9 shell sizes and 54 insert arrangements, they accommodate M39029 contacts in various sizes, including 22D, 20, 16, 12, 10 power, and 8 twinax. Constructed from aluminum, stainless steel, or lightweight composite, with plating options such as olive drab cadmium and nickel, these connectors offer durability and reliability. With RoHS-compliant and Boeing BACC-approved designs, they ensure high performance in military and aerospace applications. The D38999/24 model, a jam nut mounting receptacle with 5 removable crimp contacts, is rated for temperatures ranging from -65°C to 175°C, making it ideal for use in demanding scenarios.