MIL-DTL-38999 Series I connectors offer high-performance connectivity with up to 128 contacts in a secure environmentally sealed insert. Designed for harsh environments, these connectors operate flawlessly in temperatures ranging from -65°C to 200°C. Featuring various mounting options including front and rear wall mounts as well as jam nut receptacles, they provide versatility for different applications. Utilizing M39029 rear release crimp contacts, these connectors ensure reliable connections in sizes 22D, 22M, 22, 20, 16, and 8, accommodating a wide range of contact needs. With a rugged construction of high-strength aluminum shells and various plating options such as cadmium and nickel, they offer durability and corrosion resistance. Meeting MIL-DTL-38999 I military specifications, these circular receptacles are ideal for demanding environments where reliable electrical connections are crucial.