MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. This connector family includes front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs, available in 9 shell sizes and 52 insert arrangements. Utilizing M39029 rear release crimp contacts, they accommodate sizes 22D, 22M, 22, 20, 16, and 8 for coax and twinax applications. Constructed with high strength aluminum shells, they come in various plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS certified cadmium-free finishes. Suitable for military use, these connectors offer reliable performance with gold-plated sockets, ensuring conductivity and durability in demanding environments.