The MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Offering various mounting options such as front and rear wall mount, jam nut, and box mount receptacles, they ensure secure connections. Available in 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts for reliable performance. With aluminum shells and multiple plating options including cadmium and nickel, they meet stringent military specifications for durability. RoHS compliant finishes are also offered, making them suitable for a wide range of applications requiring high reliability and environmental protection.