MIL-DTL-38999 Series II connectors boast up to 128 contacts within their environmentally sealed inserts, designed for rugged applications with an operating temperature range from -65 °C to 200 °C. These harsh environment connectors come in various configurations including front and rear wall mount, jam nut, and box mount receptacles. Featuring thin walls and restricted lengths, they offer durability without sacrificing space efficiency. Available in 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts, ensuring secure connections. Constructed with aluminum shells and offering plating options like gold, electroless nickel, and anodized aluminum, they meet diverse industrial needs. With RoHS certified cadmium-free finishes, these connectors adhere to environmental regulations while providing reliable performance in demanding conditions.