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 offer reliability in extreme conditions. Available in various shell sizes and insert arrangements, they utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8. The connectors come in high-strength aluminum shells with plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum. RoHS compliant finishes are also available. The MIL-DTL-38999 I series includes front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs, catering to diverse application needs. With a service rating of I and a service class detail of Environment Resistant Wall and Jam Nut Mounting Receptacle and Plug Types, these connectors ensure robust performance in demanding environments.