MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert with front wall mount, rear wall mount, and jam nut receptacles. These connectors are environmentally sealed and can operate in temperatures ranging from -65 °C to 200 °C. Utilizing M39029 rear release crimp contacts in various sizes, they offer high strength aluminum shells with a choice of plating options including gold, electroless nickel, and RoHS certified finishes. With a bayonet coupling and box mounting flange, they provide reliable connectivity for military and industrial applications.