The MIL-DTL-38999 Series I connectors offer high-performance connectivity for harsh environments, featuring up to 128 contacts in an insert. These circular connectors are built to withstand extreme temperatures ranging from -65°C to 200°C, with options for front wall mount, rear wall mount, and jam nut receptacles. Compliant with military specification MIL-DTL-38999 I, they ensure reliable operation in demanding applications. With a variety of shell sizes and insert arrangements, they accommodate diverse needs, utilizing M39029 rear release crimp contacts in various sizes. Constructed with high-strength aluminum shells and offered in multiple plating options including gold, electroless nickel, and cadmium-free finishes, these connectors provide durability and corrosion resistance. Featuring bayonet coupling and removable crimp contacts, they offer easy installation and maintenance. Suitable for both wall and jam nut mounting, they are designed for environment-resistant performance, making them ideal for military, aerospace, and industrial applications.