MIL-DTL-38999 Series I connectors feature up to 128 environmentally sealed contacts, designed for harsh environments with an operating temperature range from -65 °C to 200 °C. This connector family includes front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs, offering versatility in installation. With 9 shell sizes and 52 insert arrangements, they accommodate M39029 rear release crimp contacts in various sizes, including coax and twinax. Constructed with high strength aluminum shells and available in different plating options like cadmium and nickel, they ensure durability and reliability. These connectors are ideal for military and aerospace applications, meeting stringent performance requirements.