MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert. These connectors are environmentally sealed and can operate in temperatures ranging from -65 °C to 200 °C. Available in various mounting options, including front and rear wall mount, jam nut, and box mount receptacles, they offer versatility for different applications. With 52 insert arrangements and M39029 rear release crimp contacts, they provide reliable connectivity. The aluminum shells come in different plating options, such as electroless nickel and cadmium finishes, meeting diverse requirements. These connectors, compliant with MIL-DTL-38999 II military specifications, ensure durability and performance in demanding conditions.