MIL-DTL-38999 Series I connectors are designed for harsh environments, offering up to 128 contacts in an insert with front wall mount, rear wall mount, and jam nut receptacles. Operating in temperatures ranging from -65 °C to 200 °C, these connectors are environmentally sealed for reliable performance. Featuring M39029 rear release crimp contacts in various sizes, they ensure secure connections with options for RoHS certified cadmium-free finishes. With 9 shell sizes and 52 insert arrangements available, these connectors are versatile and durable, with high strength aluminum shells and a variety of plating options including electroless nickel and cadmium olive drab. Suitable for military and industrial applications, they provide reliable connectivity in demanding conditions.