The MIL-DTL-38999 III (D38999) harsh environment connectors offer a comprehensive range of options for demanding applications. This series includes wall mount receptacles, jam nut receptacles, and straight self-locking RFI plugs, available in 9 shell sizes and 54 insert arrangements. Utilizing M39029 contacts in various sizes, from 22D to 8 twinax, these connectors ensure reliable connectivity. With shell materials such as aluminum, stainless steel, and lightweight composite, and plating options including olive drab cadmium and passivated stainless steel, they cater to diverse needs. Meeting military specifications, these connectors provide rugged performance in challenging environments.