MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs. With up to 128 contacts in an insert, they offer versatility in connectivity. These connectors are environmentally sealed and can operate in temperatures ranging from -65 °C to 200 °C. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in various sizes for secure connections. The high-strength aluminum shells come with plating options like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, offering durability. RoHS certified cadmium-free finishes are also available, catering to diverse industrial needs.