MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, offering environmental sealing and a wide operating temperature range of -65 °C to 200 °C. Designed for harsh environments, these connectors come in various mounting options including front wall mount, rear wall mount, and jam nut receptacles, with RFI grounding plugs available. With 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8, catering to diverse connectivity needs. Crafted from high-strength aluminum, they offer plating options like 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 ensure reliable performance in demanding settings.