Bearing in ABEC-7(P4) or ABEC-1(P0) for my application? ●What does Bearing Precision mean? When dealing with rolling bearings, precision is described by tolerance classes which include dimensional accuracy and running accuracy.it is regulated by ISO or other related standards. Dimensional Accuracy includes (the items related to the installation of shaft and outer shell): 1. Allowable deviation (acceptable values) for bore diameter, outer diameter, width and assembled bearing width 2. Bore diameter uniformity as seen in chamfer dimensions 3. Allowable inner ring tapered bore deviation and shape error 4. Average bore diameter variation 5. Outer diameter variation 6. Average outer diameter unevenness 7. Raceway width and height variation (for thrust bearings) Running Accuracy includes (items related to the runout of the rotator): Acceptable values for inner and outer ring radial runout and axial runout Acceptable values for inner ring side runout, and outer ring outer diameter runout Permissible variation of raceway thickness of thrust bearing Permissible deviation and variation of tapered hole Permissible variation of inclination of the outer ring surface Here I attached the comparison table from different countries: The applicable accuracy levels are different according to different types of bearings. The following table shows different types of bearings and their…