MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an environmentally sealed insert. With an operating temperature range of -65 °C to 200 °C, these connectors offer reliability in extreme conditions. Available in various mounting styles including front and rear wall mount, jam nut, and box mount receptacles, they provide flexibility for different applications. The connectors come in 9 shell sizes and 52 insert arrangements, using M39029 rear release crimp contacts for secure connections. Constructed with aluminum shells and offering plating options such as cadmium and nickel, they ensure durability and corrosion resistance. Meeting military specification MIL-DTL-38999 II, these connectors are ideal for demanding industrial and military settings.