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 like front wall mount, rear wall mount, and jam nut receptacles, they offer RFI grounding plugs for added protection. With 9 shell sizes and 52 insert arrangements, these connectors use M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8. Crafted from high-strength aluminum, they come with plating options including light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, some RoHS certified. Ideal for military and industrial applications, these connectors ensure reliable performance with their durable construction and conductive properties.