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. Offering various mounting options such as front wall mount, rear wall mount, jam nut, rear box mount, and front box mount receptacles, they ensure secure connections in diverse applications. Available in 9 shell sizes and 52 insert arrangements, these connectors use M39029 rear release crimp contacts for reliable performance. Constructed with aluminum shells and offering plating options including cadmium and electroless nickel, they meet stringent military specifications for durability. These connectors, ideal for potting applications, have a service rating of M and are RoHS compliant, ensuring environmental responsibility.