MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert with environmental sealing. Operating efficiently in temperatures ranging from -65 °C to 200 °C, these connectors offer 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 utilize M39029 rear release crimp contacts for secure connections. Constructed from aluminum with plating options such as electroless nickel and cadmium finishes, these connectors ensure reliable performance in demanding applications. RoHS certified options are also available, making them suitable for a wide range of industries.