The MIL-DTL-38999 Series I connectors feature a rugged design with up to 128 contacts enclosed in an insert, offering reliable connectivity in harsh environments. These connectors are environmentally sealed and can operate in extreme temperatures ranging from -65 °C to 200 °C, making them suitable for a wide range of applications. Available in various shell sizes and insert arrangements, they include front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. Utilizing M39029 rear release crimp contacts, they ensure secure connections in sizes 22D, 22M, 22, 20, 16, and 8 (coax and twinax). Constructed with high-strength aluminum shells, they come with a choice of plating options such as cadmium finishes and electroless nickel coating. These connectors, compliant with MIL-DTL-38999 I specifications, are designed for durability, with a mating life of 500 cycles and conductivity for efficient performance in demanding environments.