Required values of dimensions for the precision bearing are different, more higher of the product accuracy grade, more less of its dimentional deviation values(inner diameter, external diameter, ellipse etc.) than that of low-required precision grade products.

Required values of revolving precision of the precision bearing are different, more higher of the product accuracy grade, more stricter of the required revolving precision (inner diameter run-out, external diameter run-out, end surface to roller path run-out etc.) than that of low-required precision grade products.