MIL-DTL-38999 Series I connectors feature up to 128 contacts within an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various shell sizes and insert arrangements, they offer front and rear wall mount options, along with jam nut receptacles and RFI grounding plugs. These connectors utilize M39029 rear release crimp contacts, including sizes 22D, 22M, 22, 20, 16, and 8 for coax and twinax applications. Constructed with high-strength aluminum shells, they come with plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, including RoHS compliant finishes. Perfect for military and industrial use, these connectors ensure reliable performance in demanding environments.