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Cylindrical roller bearings use rollers for rolling elements, therefore they have a high load capacity. The rollers are guided by ribs on either the inner or outer ring, so these bearings are also suitable for high speed applications. The inner and outer rings can be separated to facilitate easy assembly, and both can be fit with shaft or housing tightly. If there is no ribs, either the inner or the outer ring can move freely in the axial direction. Cylindrical roller bearings are ideal to be used as so-called "free side bearings" that absorb shaft expansion.