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, they offer versatile installation options. These connectors, compliant with military specification MIL-DTL-38999, ensure reliable performance in rugged conditions, with an operating temperature range from -65 °C to 200 °C. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in various sizes, including coax and twinax. The high-strength aluminum shells come with different plating options, such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS certified cadmium-free finishes offered. Ideal for applications demanding durability and conductivity, these connectors are essential for environments requiring environment-resistant Box and Through Bulkhead Mounting Receptacle Types.