MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various mounting styles like front wall, rear wall, jam nut, and box mount receptacles, they offer versatility in installation. The plugs come in straight, RFI grounding, and standard configurations with a 90-degree cable clamp option, catering to different connectivity needs. With 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for secure connections. Crafted from aluminum, these connectors offer durability and come with plating options like cadmium and electroless nickel, ensuring reliable performance. RoHS compliant finishes further enhance their environmental sustainability, making them ideal for military and industrial applications.