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, they are available in sizes 22D, 22M, 22, 20, 16, and 8 (coax and twinax). Constructed with high-strength aluminum shells, a variety of plating options like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum are offered, including RoHS certified cadmium-free finishes. Ideal for military applications, these connectors ensure reliable performance in demanding conditions.