Hi-TTS Single Row Taper Roller Bearing TA4015 FC66999 40x50x15mm Construction Machinery Parts 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