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. These connectors are environmentally sealed and operate in temperatures ranging from -65 °C to 200 °C. Offering versatility, they come in 9 shell sizes and 52 insert arrangements, using M39029 rear release crimp contacts in various sizes. Constructed with high-strength aluminum shells, they provide reliable connectivity with options for plating, including cadmium-free finishes. The military specification compliant connectors ensure durability and performance in demanding applications.