1. Product Overview 6320 / C3 is single row open deep groove ball bearing. C3 represents enlarged internal radial clearance to accommodate thermal expansion during continuous operation. Open design facilitates periodic cleaning and re-lubrication. It supports radial load and minor bidirectional axial load. Widely fitted on large motors, centrifugal pumps, industrial fans and heavy-duty transmission machinery. Formal quotation will be sent within 24 hours upon your inquiry. 2.