Transcription of NTN Technical Information Series PDF's
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NTN Technical Information Series PDF's
A-22 Technical TolerancesBearing tolerances; , dimensional accuracy, runningaccuracy, etc., are regulated by standards such as ISO andJIS. For dimensional accuracy these standards prescibetolerances and allowable error limitations for those boundrydimensions (bore diameter, outside diameter, width, assembledbearing width, chamfer, and taper) necessary when installingbearings on shafts or in housings. For machining accuracy thestandards provide allowable variation limits on bore, mean bore,outside diameter, mean outside diameter and raceway widthor wall thickness (for thrust bearings). Running accuracy isdefined as the allowable limits for bearing runout. Bearingrunout tolerances are included in the standards for inner andouter ring radial and axial runout; inner ring side runout withbore; and outer ring outside surface runout with and allowable error limitations are established foreach tolerance grade or class.
A-26 Technical Data Table 4.3 Tolerance for radial bearings (Except tapered roller bearings) Table 4.3 (1) Inner rings Nominal bore diameter ∆ dmp V dp d diameter series 7,8,9 diameter series 0,1 diameter series 2,3,4
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