The boundary dimensions of commonly used NSK bearings mostly conform to the organizational concept of ISO, and the NSK bearing numbers of these standard bearings are specified by JIS B 1513 (Bearing numbers for rolling bearings)- Due to a need for more detailed classification, NSK uses auxiliary symbols other than those specified by JIS-
Ball Bearings. Ball bearings reduce friction between shafts and axles and carry radial loads! thrust loads! or a combination of both. They contain an outer ring! inner ring! and a cage that holds and spaces bearing balls! the bearing's spherical rolling elements.