Inner rings for cylindrical roller bearings of the NJ design are supplied as separate components. This enables full interchangeability of inner rings while maintaining radial clearance. An inner ring can also be combined with an outer ring with roller and cage assembly to create a complete bearing. As available separate parts, inner rings can be replaced during the maintenance of complete bearings. Having one integral flange, inner rings for NJ design bearings can accommodate axial displacement in one direction.