MIL-DTL-38999 Series II connectors offer high-performance connectivity with up to 128 contacts in a sealed insert, designed for harsh environments. Operating between -65 °C and 200 °C, these connectors feature various mounting options including front and 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 for secure connections. Constructed with aluminum shells and offering plating options like cadmium and nickel, these connectors ensure reliability in demanding applications. With RoHS certified finishes, they meet environmental standards while providing a durable solution for military and industrial needs.