MIL-DTL-38999 Series I connectors offer high-performance solutions for harsh environments, featuring up to 128 contacts in an environmentally sealed insert. Operating in temperatures ranging from -65 °C to 200 °C, these connectors come in various configurations, including 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 utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8. Constructed with high-strength aluminum shells, they come with plating options such as iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, offering flexibility and durability. These connectors, compliant with MIL-DTL-38999 I military specifications, are ideal for a wide range of applications requiring reliable and rugged connectivity in demanding environments.