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 thin-walled connectors come in various mounting options including front wall, rear wall, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts. Constructed with aluminum shells, they offer plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum. With RoHS certified finishes, these connectors ensure reliable performance for military and aerospace applications.