MIL-DTL-38999 Series I connectors offer high performance in harsh environments, featuring up to 128 contacts sealed for environmental protection. With an operating range of -65 °C to 200 °C, these connectors come in various configurations including front and rear wall mount receptacles and jam nut receptacles, along with RFI grounding plugs. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8. Constructed with durable high-strength aluminum shells, they come with a range of plating options like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum. RoHS certified cadmium-free finishes are also available, ensuring compliance with environmental regulations. Perfect for military and industrial applications, these connectors provide reliable connectivity with a contact mating life of 500 cycles.