Introducing MIL-DTL-38999 Series I connectors, designed for harsh environments with up to 128 contacts housed in an environmentally sealed insert. Operating seamlessly in temperatures ranging from -65 °C to 200 °C, these connectors feature a robust construction with options for front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. With 9 shell sizes and 52 insert arrangements to choose from, they offer versatility in various applications. Utilizing M39029 rear release crimp contacts, these connectors ensure secure connections with sizes 22D, 22M, 22, 20, 16, and 8, including coax and twinax variants. Crafted from high-strength aluminum, they come with a range of plating options like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, catering to diverse needs. RoHS certified cadmium-free finishes are also available, meeting environmental standards. Ideal for military and industrial use, these MIL-DTL-38999 I connectors guarantee reliable performance in demanding conditions.