MIL-DTL-38999 Series I connectors are designed for harsh environments, offering up to 128 contacts in an insert with front wall mount, rear wall mount, and jam nut receptacle options. These connectors, featuring RFI grounding plugs, 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, including coax and twinax. Constructed with high-strength aluminum shells and offering plating options such as cadmium and nickel, these connectors ensure durability and performance. Suitable for military and industrial applications, they meet stringent MIL-DTL-38999 I specifications, making them ideal for use in environments requiring reliable electrical connections.