Roller NTN Bearing rating

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 Cylindrical and tapered roller tolerances are divided into four: 0, I, II, level III, tolerance grades were decreased. 0 and â…  grade roller demanding and difficult of production, production capacity is less; class II and III level roller easier production, the production of larger quantities.abec 7 bearings
 Needle tolerance is divided into three levels: 2, 3 and 5. angular ball bearings
Tolerance level in order to reduce their tolerance level of value is consistent with the required value of the needle of the batch diameter variation. Mass production of three needle.thrust bearings