The MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various configurations like front and rear wall mount, jam nut, and box mount receptacles, they offer versatility in installation. These connectors, compliant with military specification MIL-DTL-38999 II, come in 9 shell sizes and 52 insert arrangements, using M39029 rear release crimp contacts. Constructed with aluminum shells and offering plating options including gold, electroless nickel, and cadmium finishes, they ensure reliable performance. With features like bayonet coupling and RoHS compliant options, these connectors are suitable for demanding applications that require durability and high performance in extreme conditions.