The 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 can operate in temperatures ranging from -65 °C to 200 °C. Offering 52 insert arrangements and utilizing M39029 rear release crimp contacts, they ensure reliable connectivity in various applications. Made with high-strength aluminum shells and available in different plating options, including RoHS compliant finishes, these connectors guarantee durability and performance. Suitable for military and industrial use, they are ideal for demanding environments where secure and efficient electrical connections are essential.