MIL-DTL-38999 Series II connectors are robustly designed for harsh environments, featuring up to 128 contacts housed in a sealed insert. With a wide operating temperature range of -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 application needs. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating M39029 rear release crimp contacts. Constructed with aluminum shells and offering multiple plating options including cadmium and nickel, they ensure durability and corrosion resistance. Ideal for military and industrial use, these connectors provide secure electrical connections in demanding environments.