The grade of precision of DAY Bearing are made into Grade0, Grade6, Grade5, Grade4, according to the National standard GB307. 1-94.

According to the National Standard GB4604(equivalent to: ISO5753-1991), the radial play of DAY Bearing are divided into Group2, Group0, Group3, Group4, Group5.

Usually, the tolerance of DAY deep group ball bearing is controlled on the bas is of the class p6, if customer requests, the tolerance class can be p5, class.

Ball bearing with two shields or two seals are supplied greased with shell Alvania No. 2 or chevron SR#2 as standard and are ready to use. Upon request ball bearings can be lubricate with other grease or oil to any specification. Customer need to mark on your purchase order.