The MIL-DTL-38999 III (D38999) harsh environment connectors feature wall mount receptacles, jam nut receptacles, and straight self-locking RFI plugs. Available in 9 shell sizes and 54 insert arrangements, they utilize M39029 contacts in various sizes, including 22D, 20, 16, 12, 10 power, and 8 twinax. With shell options in aluminum, stainless steel, and lightweight composite, these connectors offer versatility. Plating choices range from olive drab cadmium to passivated stainless steel, meeting RoHS-compliance and Boeing BACC standards. Perfect for demanding applications, they ensure reliable connectivity in rugged environments.