MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, designed for rugged applications with an operating temperature range of -65 °C to 200 °C. This harsh environment connector family includes front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. Offered in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in various sizes. Constructed with high strength aluminum shells, these connectors come with plating options like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS certified cadmium-free finishes available. Ideal for military and industrial use, these connectors provide reliable performance in demanding conditions.