Dimensional tolerances

For bearings made to Normal tolerances, the dimensional tolerances for cylindrical seats should be, at the very minimum, IT6 grade for the shaft and IT7 for the housing. Where adapter or withdrawal sleeves are used, wider diameter tolerances (IT9 grade) can be permitted for shaft seats (table 1). The numerical values of standard IT tolerance grades in accordance with ISO 286-1:2010 are listed in table 2. For bearings with higher dimensional accuracy, correspondingly tighter grades should be used.
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