The MIL-DTL-38999 Series II connectors are designed for harsh environments, offering up to 128 contacts and environmental sealing. Operating between -65 °C and 200 °C, these connectors come in various configurations including front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes with 52 insert arrangements, they use M39029 rear release crimp contacts. Made of aluminum, they feature plating options such as cadmium and nickel, with RoHS certified finishes. Ideal for military and industrial applications, these connectors provide reliable connectivity in demanding conditions.