The MIL-DTL-38999 Series I connectors feature up to 128 contacts housed in an insert, designed for harsh environments with an operating temperature range of -65°C to 200°C. Available in various configurations including front and rear wall mount, as well as jam nut receptacles, these connectors offer RFI grounding plugs for added functionality. With 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8, accommodating coax and twinax contacts. Constructed with high-strength aluminum shells, they come in a range of plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS-certified cadmium-free finishes available. Ideal for military and industrial applications, these connectors provide reliable performance in demanding environments.