MIL-DTL-38999 Series I connectors are designed for rugged environments, featuring up to 128 contacts in an insert with environmentally sealed construction. Operating effectively in temperatures ranging from -65 °C to 200 °C, these connectors offer versatility with front wall mount, rear wall mount, and jam nut receptacles, as well as RFI grounding plugs. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in various sizes. Constructed with high strength aluminum shells, they come in different plating options like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS certified cadmium-free finishes also available. Perfect for military specifications, these connectors are ideal for applications requiring durability and performance in harsh environments.