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