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, they offer versatility in installation. Operating between -65 °C and 200 °C, these connectors are environmentally sealed for reliable performance. Utilizing M39029 rear release crimp contacts, they come in various sizes, including 22D, 22M, 22, 20, 16, and 8 for coax and twinax applications. The high strength aluminum shells are available in different plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS certified cadmium-free finishes. Suitable for military use, these connectors ensure secure and durable electrical connections in demanding settings.