MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. This connector family includes front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. Offered in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in various sizes, suitable for different applications. Constructed with high strength aluminum shells, they come in a range of plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, including RoHS certified cadmium-free finishes. The connectors are MIL-DTL-38999 I compliant, ensuring reliability in military and industrial settings.