Four-row cylindrical roller bearings are mainly used for heavy machinery, such as for supporting rollers used in rolling mills such as roughing mills, profile mills, and sheet mills. Four-row cylindrical roller bearings are classified into FC type, FCD type and FCDP type according to whether there is a rib on the outer ring and whether the inner ring is one or two. Still some inner holes are structural forms of tapered holes.
All types of four-row cylindrical roller bearings can only withstand radial loads, so they must be used with thrust bearings, such as angular contact ball bearings, tapered roller bearings, etc.
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