MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various mounting options, including front and rear wall mount, jam nut, and box mount receptacles, they offer versatility for different applications. These connectors, with 52 insert arrangements and M39029 rear release crimp contacts, ensure reliable connectivity. Constructed with aluminum shells and offering plating options like electroless nickel and cadmium finishes, they meet stringent military specifications for durability. With a maximum operating temperature of 150 °C and a service rating of I, these connectors are ideal for demanding environments where performance and reliability are crucial.