MIL-DTL-38999 Series I connectors feature up to 128 contacts enclosed in an environmentally sealed insert, designed for extreme operating conditions ranging from -65 °C to 200 °C. This connector family includes front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs, offering versatility for various applications. With 9 shell sizes and 52 insert arrangements available, these connectors utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8, 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, with RoHS-certified cadmium-free finishes. Ideal for military and industrial use, these connectors ensure reliable performance in demanding environments.