MIL-DTL-38999 Series I connectors offer high-performance connectivity with up to 128 contacts in an insert. These environmentally sealed connectors are designed for harsh environments, featuring front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. With a wide operating temperature range of -65 °C to 200 °C, they ensure reliable performance in extreme conditions. Available in 9 shell sizes and 52 insert arrangements, these connectors use M39029 rear release crimp contacts in various sizes, including coax and twinax options. Constructed with high-strength aluminum shells, they come with a choice of plating options, such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum. RoHS certified finishes are also available, making them suitable for diverse applications.