MIL-DTL-38999 Series I connectors are designed for rugged environments, featuring up to 128 contacts in a sealed insert. With an operating range of -65 °C to 200 °C, they offer reliability in extreme conditions. Available in various shell sizes and insert arrangements, these connectors come in aluminum shells with plating options like cadmium and nickel. Mating is via bayonet coupling, with options for wall mount and jam nut receptacles. Utilizing M39029 crimp contacts, they ensure secure connections for applications requiring durability and performance in harsh environments.