The MIL-DTL-38999 Series II connectors feature up to 128 contacts enclosed in an insert, designed for harsh environments with an operating temperature range from -65 °C to 200 °C. These connectors come in various configurations such as front wall mount, rear wall mount, jam nut, rear box mount, and front box mount receptacles. 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 including light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum. With RoHS certified cadmium-free finishes, these connectors ensure reliable performance in demanding applications.