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. These connectors, with up to 128 contacts in an insert, are environmentally sealed and operate in temperatures ranging from -65 °C to 200 °C. 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, they come in plating options like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, including RoHS certified finishes. The MS27496 connectors, part of the 38999 Series I, ensure reliable performance in demanding applications.