The MIL-DTL-38999 III (D38999) harsh environment connectors feature a range of options including 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 for optimal connectivity. With shell materials in aluminum, stainless steel, and lightweight composite, and plating options like olive drab cadmium, nickel, black zinc nickel, and passivated stainless steel, these connectors offer versatility. They meet RoHS compliance standards and Boeing BACC-approved designs, making them suitable for a wide array of applications in demanding environments.