MIL-DTL-38999 III (D38999) harsh environment connectors offer a range of options including wall mount receptacles, jam nut receptacles, and straight self-locking RFI plugs. Available in various shell sizes and insert arrangements, they feature M39029 contacts in sizes 22D, 20, 16, 12, 10 power, and 8 twinax. With shell materials such as aluminum, stainless steel, and lightweight composite, and plating options like olive drab cadmium, nickel, black zinc nickel, and passivated stainless steel, these connectors ensure durability in diverse applications. They also meet RoHS compliance and Boeing BACC standards, making them suitable for environmentally conscious and industry-regulated settings.