MIL-DTL-38999 Series I connectors offer high-performance connectivity in harsh environments, featuring up to 128 contacts in an insert. Designed for rugged applications, these connectors are environmentally sealed and can operate in temperatures ranging from -65 °C to 200 °C. The family includes front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs, providing versatility in installation. With 9 shell sizes and 52 insert arrangements, they accommodate various contact types, including M39029 rear release crimp contacts. Constructed with high-strength aluminum shells and available in different plating options such as gold, electroless nickel, and cadmium finishes, these connectors ensure reliable performance. Suitable for military and industrial use, they meet MIL-DTL-38999 I specifications for durability and quality.