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. With an operating temperature range of -65°C to 200°C, they offer reliable performance in extreme conditions. These connectors utilize M39029 rear release crimp contacts in various sizes and are available in 9 shell sizes and 52 insert arrangements. Constructed with high-strength aluminum shells and offering multiple plating options, including RoHS-certified finishes, they ensure durability and conductivity. Ideal for military and aerospace applications, these connectors are environmentally sealed and provide secure, conductive connections in demanding settings.