MIL-DTL-38999 Series I connectors offer high-performance connectivity for harsh environments. With up to 128 contacts in an insert, these circular plugs are designed for durability and reliability. Featuring front wall mount, rear wall mount, and jam nut receptacles, as well as RFI grounding plugs, they provide versatile options for various applications. Operating between -65°C and 200°C, they are suitable for extreme temperature conditions. Utilizing M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8 (coax and twinax), they ensure secure connections. Made with high-strength aluminum shells and available in different plating options, including RoHS certified finishes, these connectors meet rigorous standards for military and industrial use. With a service rating of M and a contact mating life of 500 cycles, they offer long-lasting performance in demanding environments.