MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, offering environmental sealing and a wide operating temperature range from -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. With 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts in various sizes. The connectors, housed in high-strength aluminum shells, come with plating options such as cadmium and nickel, and are also available in RoHS-certified finishes. Perfect for military and industrial applications, these connectors provide reliable connectivity in demanding environments.