MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts sealed for environmental protection. With an operating temperature range from -65 °C to 200 °C, these connectors offer reliable performance in extreme conditions. Available in various mounting styles such as front and rear wall mount, jam nut, and box mount receptacles, they cater to diverse installation needs. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating M39029 rear release crimp contacts in different sizes. Constructed with aluminum shells and offering plating options like cadmium and nickel, they ensure durability and corrosion resistance. Suitable for military and industrial applications, these connectors meet stringent quality standards for reliable connectivity in demanding environments.