MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert with front wall mount, rear wall mount, and jam nut receptacles. Operating in temperatures ranging from -65 °C to 200 °C, these connectors provide reliable performance. Utilizing M39029 rear release crimp contacts, they come in 9 shell sizes and 52 insert arrangements, accommodating various needs. Constructed with high-strength aluminum shells and available in different plating options, including RoHS certified finishes, they offer durability and versatility. With a bayonet coupling and gold contact plating, these connectors ensure secure and efficient electrical connections, suitable for military and industrial applications.