MIL-DTL-38999 Series I connectors offer up to 128 contacts in a sealed insert, ideal for harsh environments with a wide operating temperature range of -65 °C to 200 °C. Available in various configurations like front and rear wall mount, as well as jam nut receptacles, they feature RFI grounding plugs for added functionality. With 9 shell sizes and 52 insert arrangements, they use 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, these connectors come with plating choices such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS certified cadmium-free finishes available. Meeting MIL-DTL-38999 I military specifications, they ensure reliable performance in demanding applications.