MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Offering front wall mount, rear wall mount, and jam nut receptacles, as well as RFI grounding plugs, they come in 9 shell sizes and 52 insert arrangements. Utilizing M39029 rear release crimp contacts in various sizes, including coax and twinax options, these connectors are housed in high-strength aluminum shells with a choice of plating finishes, such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum. RoHS certified cadmium-free options are available. Perfect for military and industrial applications, these connectors provide reliable connectivity in demanding conditions.