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 like front and rear wall mount, jam nut, and box mount receptacles, they offer versatility in connectivity solutions. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating M39029 rear release crimp contacts. Constructed with aluminum shells and offered in different plating options including cadmium and nickel, they ensure durability and reliability in military and aerospace applications. With a straight plug design and gold contact plating, these connectors provide secure and efficient electrical connections, meeting stringent performance standards.