The accuracy of the bearing mainly includes two aspects, one is the dimensional accuracy, and the other is the rotation accuracy. The former is an item required after the bearing is installed. The rotation accuracy is a range that specifies the verticality tolerances of the pendulum during rotation, including the radial and axial swing of the inner and outer rings, the side ring of the inner ring, and the radial surface.

The accuracy grade of the bearing increases from ordinary 0 to 6, 5, 5, and 2. The bearing standard adopted in China is stipulated in GB307.

The tapered roller bearing is a separate bearing. The structure of this bearing is mainly a tapered raceway on the inner and outer rings. It has three different structural types, which are: single-row tapered roller bearings, double-row tapered roller bearings and tear tapered roller bearings according to the number of roller rows.

Tapered roller bearings are mainly used to support the combined radial and axial load. The raceway angle of the outer ring will directly affect the bearing capacity of the bearing. The larger the raceway angle of the outer ring, the greater the bearing capacity of the bearing. The clearance of single-row tapered roller bearings needs to be adjusted by the user during installation. The clearances of double-row and four-row tapered roller bearings are initially set according to customer requirements at the factory, and do not require users to adjust.

The main reason why tapered roller bearings are separated is that they consist of an inner ring with a roller and a cage assembly. It has performed well in many areas of industrial life, the most commonly used areas are: automotive, rolling mills, metallurgy, mining and plastic machinery, etc.