The MIL-DTL-38999 Series I connectors offer a robust solution for harsh environments, featuring up to 128 contacts within an insert. Designed for reliability, these connectors are environmentally sealed and capable of operating in extreme temperatures ranging from -65 °C to 200 °C. With various mounting options including front wall, rear wall, and jam nut receptacles, they provide flexibility for different applications. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8. Constructed with high-strength aluminum shells and available in multiple plating options such as cadmium and nickel, they ensure durability and performance. Meeting military specification MIL-DTL-38999 I, these circular plugs are ideal for demanding environments that require secure and reliable connectivity.