MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, designed for harsh environments with operating temperatures ranging from -65 °C to 200 °C. These connectors come in various configurations including front wall mount, rear wall mount, jam nut, and box mount receptacles. Offering versatility with 52 insert arrangements and utilizing M39029 rear release crimp contacts, they ensure reliable connectivity. With a choice of aluminum shells and plating options such as cadmium and nickel, these connectors meet stringent military specifications for durability. Suitable for diverse applications, they provide secure and conductive socket connections, making them ideal for environmental resistance in demanding settings.