The MIL-DTL-38999 Series I 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 mount types including front wall, rear wall, and jam nut receptacles, they offer reliable RFI grounding. With 52 insert arrangements and M39029 rear release crimp contacts, they ensure secure connections in sizes 22D, 22M, 22, 20, 16, and 8. Constructed with high-strength aluminum shells and offering different plating options such as cadmium and nickel, these connectors meet stringent military specifications for durability and performance in demanding applications.