1. Metric series (single row Tapered Roller Bearing): The applicable standard is GB307 and the applicable accuracy class includes 0, 6, 5 and 4.

2. Metric series (double-row, four-row Tapered Roller Bearing): The applicable standard is SB/T5341994 and the applicable accuracy class is 0.

3. Inch series Tapered Roller Bearing: The applicable standard is SB/CO/T1089 and the applicable accuracy class is 4, 2, 3, 0 and 00.

Influencing Factors of Accuracy of Tapered Roller Bearing

The precise tapered roller bearing is installed on the spindle of the jig boring machine. The runout of the inner ring of the complete set of bearings to the raceway and the radial runout of the inner ring of the complete set of bearings are the key precision indexes. There are eight factors that affect the rotating precision of middle and large precise tapered roller bearings: Gauge lot variation of cone angle of the roller, isoline straightness of roller, free radial movement of retainer, isoline perpendicularity of retainer pocket slope, roundness error of ring raceway, isoline straightness of ring raceway, assembly technology, testing methods.