MIL-DTL-38999 Series I connectors offer reliable performance in harsh environments with up to 128 contacts housed in an environmentally sealed insert. These versatile connectors, featuring front wall mount, rear wall mount, and jam nut receptacles, are designed for demanding applications. With a wide operating temperature range of -65 °C to 200 °C, they ensure consistent functionality in extreme conditions. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating various needs. Utilizing M39029 rear release crimp contacts in different sizes, including coax and twinax, they provide flexibility for connectivity. Constructed with high strength aluminum shells and available in multiple plating options such as cadmium and nickel, they offer durability and corrosion resistance. Additionally, with RoHS certified cadmium-free finishes, they meet environmental standards. These MIL-DTL-38999 I connectors, with their gold-plated contacts and bayonet coupling, guarantee secure and efficient electrical connections for military and industrial applications.