MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert with environmental sealing. Operating between -65 °C and 200 °C, these connectors offer various mounting options like front wall mount, rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts. Constructed with aluminum shells and offered in plating options like cadmium and nickel, these connectors ensure reliable performance. With RoHS certified finishes, they meet environmental standards, making them ideal for military and industrial applications.