MIL-DTL-38999 Series I connectors offer high-performance connectivity with up to 128 contacts in an environmentally sealed insert. Designed for harsh environments, they feature front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. With 9 shell sizes and 52 insert arrangements available, they accommodate various configurations, utilizing M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8. These connectors, housed in durable aluminum shells, come in plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, with RoHS-certified cadmium-free finishes. Operating reliably in temperatures ranging from -65°C to 200°C, they ensure secure and efficient electrical connections in critical applications.