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6021 Ball bearing
The outer ring of the roller bearing adopts a full-loaded cylindrical roller bearing with a thicker outer ring wall. The outer diameter surface of the roller has a cylindrical shape and an arc, which can be designed to match the raceway surface according to the use occasion. With this outer ring, the roller can roll directly on the raceway and can withstand heavy loads and impact loads. The combined roller bearing consists of a main roller, a side roller, a shaft head and a cover plate.