Hi-TTS NJ2304 Single Row Taper Roller Bearing 20x52x21mm Open Construction Machinery Part Describe: A roller bearing is a type of rolling-element bearing that uses cylindrical, tapered, needle, or barrel-shaped rollers to reduce friction between moving parts. Unlike ball bearings that have point contact, roller bearings have line contact, which allows them to support heavier loads and have greater rigidity. They are used in various applications, including conveyor systems,