MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an environmentally sealed insert. With an operating temperature range of -65 °C to 200 °C, these connectors are suitable for a wide range of applications. Available in various shell sizes and insert arrangements, they utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8. Constructed with high-strength aluminum shells, they offer durability and reliability. Plating options include light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, catering to different environmental requirements. These connectors, compliant with RoHS regulations, come in different configurations such as front wall mount, rear wall mount, and jam nut receptacles, with RFI grounding plugs. Perfect for military and industrial use, they ensure secure and efficient electrical connections in demanding settings.