MIL-DTL-38999 Series I connectors feature up to 128 contacts housed in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs, they offer versatility in installation. With 9 shell sizes and 52 insert arrangements, these connectors use M39029 rear release crimp contacts in various sizes, including coax and twinax. Constructed with high-strength aluminum shells, they come in multiple plating options such as cadmium and electroless nickel. Offering RoHS certified finishes, these connectors ensure reliability in demanding applications.