MIL-DTL-38999 Series II connectors are designed for harsh environments, offering up to 128 contacts in an environmentally sealed insert. With an operating temperature range from -65 °C to 200 °C, these connectors are reliable in extreme conditions. Featuring various mounting options such as front and rear wall mount, jam nut, and box mount receptacles, they provide versatility in installation. Available in 9 shell sizes and 52 insert arrangements, these connectors use M39029 rear release crimp contacts for secure connections. Constructed with aluminum shells and offering multiple plating options including cadmium and nickel, they ensure durability and corrosion resistance. Suitable for military and industrial applications, these connectors meet MIL-DTL-38999 II standards, providing reliable performance in demanding environments.