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 versatility in installation. These connectors, compliant with military specification MIL-DTL-38999 I, ensure reliable performance with an operating temperature range of -65 °C to 200 °C. Utilizing M39029 rear release crimp contacts, they come in various sizes, including sizes 22D, 22M, 22, 20, 16, and 8 for coax and twinax applications. The high-strength aluminum shells are available in different plating options, such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, catering to diverse needs. RoHS certified cadmium-free finishes are also offered, making them environmentally friendly choices for critical applications.