Tolerances control the dimensional accuracy of a bearing.
For exact tolerance limits, please view our TOLERANCE TABLES
To see what measurements are checked, see BEARING TOLERANCES EXPLAINED
ISO bearing tolerances start at P0 and then move upwards to precision grades P6, P5 and then P4. ISO tolerances are measured in thousandths of a millimetre (or microns). AFBMA (ABEC) bearing tolerances are also commonly used and these are measured in ten-
Assuming that the shaft and housing are manufactured to the same tolerances as the bearing, tighter bearing tolerances will improve mating between shaft/housing and bearing, noise/vibration levels and starting/running torque.