MIL-DTL-38999 III (D38999) harsh environment connectors are designed for rugged applications, featuring wall mount receptacles, jam nut receptacles, and straight self-locking RFI plugs. Available in 9 shell sizes and 54 insert arrangements, they use M39029 contacts in various sizes for optimal connectivity. Constructed from durable materials such as aluminum, stainless steel, and lightweight composite, with a range of plating options including olive drab cadmium, nickel, and passivated stainless steel. Offering RoHS-compliant and cadmium-free finishes, these connectors meet stringent military specifications and are ideal for aerospace and defense applications.