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 options including front wall mount, rear wall mount, jam nut, and box mount receptacles, they offer versatility in applications. With 52 insert arrangements and shell sizes, these connectors use M39029 rear release crimp contacts for reliable connectivity. Made from aluminum with plating options like electroless nickel, they ensure durability and performance. Meeting military specification MIL-DTL-38999 II, these circular plugs are ideal for demanding environments with their conductive, environment-resistant design.