MIL-DTL-38999 Series I connectors feature up to 128 contacts housed in an environmentally sealed insert, designed for rugged 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, along with RFI grounding plugs, offering versatility in installation. With 9 shell sizes and 52 insert arrangements available, they accommodate M39029 rear release crimp contacts in various sizes, ensuring compatibility with different wire gauges. Constructed with high-strength aluminum shells, these connectors come with a choice of plating options including light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS compliant finishes available. Suitable for military and industrial applications, these connectors provide reliable connectivity in harsh conditions.