MIL-DTL-38999 Series I connectors feature up to 128 contacts within an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various mounting options such as front wall, rear wall, and jam nut receptacles, these connectors offer RFI grounding plugs for added versatility. With 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8, including coax and twinax. The connectors come in high-strength aluminum shells with plating options like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, offering RoHS certified cadmium-free finishes. Perfect for military applications, these MIL-DTL-38999 I connectors provide reliable performance in demanding conditions.