MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert for high-density applications. With front wall mount, rear wall mount, and jam nut receptacles available, they offer versatility in installation. These connectors are environmentally sealed and can operate in extreme temperatures ranging from -65 °C to 200 °C. Utilizing M39029 rear release crimp contacts, they ensure secure and reliable connections in sizes 22D, 22M, 22, 20, 16, and 8, including coax and twinax options. The connectors come in high strength aluminum shells with various plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, catering to different environmental requirements. With RoHS-certified cadmium-free finishes available, they meet modern compliance standards. Ideal for military and aerospace applications, these connectors are known for their durability and performance in demanding conditions.