MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert for high-density connectivity. With an operating temperature range of -65 °C to 200 °C, they offer reliable performance in extreme conditions. These circular connectors come in various shell sizes and insert arrangements, with options for front wall mount, rear wall mount, and jam nut receptacles. Utilizing M39029 rear release crimp contacts, they ensure secure connections in military and aerospace applications. The connectors are environmentally sealed and made of high-strength aluminum, with plating options including cadmium, electroless nickel, and anodized aluminum. Offering RoHS certified finishes, they meet stringent environmental standards. Perfect for box mounting and back panel applications, these MIL-DTL-38999 I connectors provide durability and conductivity, with a service life of 500 cycles.