MIL-DTL-38999 Series I connectors feature up to 128 environmentally sealed contacts within an insert, designed for harsh environments with an operating temperature range of -65°C to 200°C. This connector family includes front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs, offering versatility in installation. With 9 shell sizes and 52 insert arrangements available, they utilize M39029 rear release crimp contacts in various sizes, including coax and twinax options. Constructed with high-strength aluminum shells, these connectors come with multiple plating choices such as cadmium and nickel, ensuring durability and reliability. Suitable for military and industrial applications, they meet stringent requirements for connectivity in rugged settings.