MIL-DTL-38999 Series I connectors feature up to 128 contacts housed in an insert, designed for harsh environments with an operating temperature range from -65 °C to 200 °C. Available in various mounting options like front wall mount, rear wall mount, and jam nut receptacles, they offer RFI grounding plugs for added functionality. Compliant with military specifications, these connectors come in 9 shell sizes and 52 insert arrangements, utilizing M39029 rear release crimp contacts. Constructed with high-strength aluminum shells, they offer a choice of plating options, including light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum. With RoHS certified cadmium-free finishes available, these connectors are ideal for applications requiring durability and reliability in demanding environments.