NTN SC04B19CS30PX1 Deep Groove Ball Bearing 20x56x12mm

Open Deep Groove Ball Bearings: One of the most commonly used bearings, the open types are manufactured without seals to allow for the free circulation of either oil or grease, used in gearboxes and other environments where no foreign matter would be present and a lubricant supply is available.
Benefits: Used widely in transmissions etc, can be used in oil or greased, cost effective solution