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. These connectors come in various configurations, including front and rear wall mount, jam nut, and box mount receptacles, offering versatility for different applications. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12. Constructed with aluminum shells, they offer plating options such as electroless nickel and iridescent yellow cadmium for enhanced durability. With RoHS certified cadmium-free finishes, these connectors ensure reliable performance in demanding environments.