MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert. With an operating temperature range of -65 °C to 200 °C, these connectors are environmentally sealed for reliability. Available in various mount types including front and rear wall mount, jam nut, and box mount receptacles, they offer versatility in installation. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating M39029 rear release crimp contacts in multiple sizes. Constructed with aluminum shells and offering plating options like cadmium and nickel, they ensure durability. Meeting military specification MIL-DTL-38999 II, these connectors are ideal for applications requiring rugged performance in demanding conditions.