MIL-DTL-38999 Series I connectors, designed for harsh environments, feature front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs. With up to 128 contacts in an insert, they offer high strength aluminum shells and are environmentally sealed, operating in temperatures ranging from -65 °C to 200 °C. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts in various sizes, including coax and twinax. Plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum cater to different needs, with RoHS certified cadmium-free finishes also offered. Ideal for military and industrial applications, these connectors provide reliable performance in demanding conditions.