MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts within an insert. These connectors are environmentally sealed and can operate in temperatures ranging from -65°C to 200°C. Available in various shell sizes and insert arrangements, they offer front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. Constructed with high-strength aluminum shells, they come in plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS-certified cadmium-free finishes also available. Utilizing M39029 rear release crimp contacts, they ensure reliable connectivity for applications requiring durability and performance in demanding conditions.