MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts housed in a sealed insert. With an operating temperature range of -65°C to 200°C, these connectors offer reliability in extreme conditions. Available in various shell sizes and insert arrangements, they utilize M39029 rear release crimp contacts for secure connections. The connectors, with front wall mount, rear wall mount, and jam nut receptacles, also include 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, meeting RoHS compliance standards. Suitable for military applications, these connectors ensure durable and efficient electrical connections in demanding environments.