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. Available in various shell sizes and insert arrangements, they offer front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. Utilizing M39029 rear release crimp contacts, these connectors ensure reliable connectivity with options for gold contact plating. Built with high strength aluminum shells and offered in RoHS compliant finishes, including electroless nickel, they provide durability and corrosion resistance. Perfect for military and aerospace applications, these circular plugs guarantee secure and conductive connections, with a service rating of I for environmental resistance.