X-Long 5/16" Hex Key Socket

5/16" & 6mm X-Long Hex Key Sockets Some regulator manufacturers are internally broaching the yoke nut to provide an additional method of removing/installing this part. The majority of these first stages utilize a 5/16" or 6mm hex socket inside the yoke nut. To reach the socket, via the yoke screw hole, an X-long hex bit is required. The tools illustrated to the right have a hex key that measures a full 5" below the drive head. The hex key is retained by a set screw, allowing for easy replacement or modification if necessary. This tool fits a standard 3/8" drive ratchet handle or torque wrench.