MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, designed for rugged applications with an operating temperature range of -65 °C to 200 °C. This harsh environment connector family includes front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. Offering versatility, they come in 9 shell sizes and 52 insert arrangements, utilizing M39029 rear release crimp contacts in various sizes. Constructed with high strength aluminum shells and available in different plating options such as cadmium and nickel, these connectors ensure reliable performance in demanding conditions. Suitable for military and industrial use, they meet stringent MIL-DTL-38999 I specifications.