The MIL-DTL-38999 Series II connectors are designed for harsh environments, offering up to 128 contacts in an insert with environmental sealing. Operating between -65 °C and 200 °C, they provide reliable performance in extreme conditions. Featuring various mounting options including front and rear wall mount, jam nut, and box mount receptacles, these connectors are versatile for different applications. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts for secure connections. Made of aluminum with plating options like cadmium and nickel, they ensure durability and corrosion resistance. Meeting military specifications, these connectors are ideal for demanding industries.