Tapered roller bearings are separable bearings. Both the inner and outer rings of the bearing have tapered raceways. This type of bearing is divided into single-row, double-row and four-row tapered roller bearings according to the number of rows installed. Single row tapered roller bearings can bear radial load and single direction axial load. When the bearing bears radial load, it will produce an axial component force, so when it needs another bearing that can bear the axial force in the opposite direction to balance it. It is widely used in industries such as automobiles, rolling mills, mining, metallurgy, and plastic machinery.

The ability of single-row tapered roller bearings to bear axial load depends on the contact angle, that is, the outer ring raceway angle. The greater the angle, the greater the axial load capacity. The most used tapered roller bearing is the single row tapered roller bearing. Small-sized double-row tapered roller bearings are used in the front wheel hubs of cars. Four-row tapered roller bearings are used in heavy machines such as large cold and hot rolling mills.

Structural features
The type code of the tapered roller bearing is 30000, and the tapered roller bearing is a separable bearing. Under normal circumstances, especially in GB/T307.1-94 "Rolling Bearing Radial Bearing Tolerance", the tapered roller bearing outer ring and inner component can be used interchangeably in 100% of the size range.
The angle of the outer ring and the diameter of the outer raceway are the same as the outer dimensions and have been standardized. It is not allowed to change during design and manufacturing. As a result, the outer ring and inner assembly of the tapered roller bearing can be interchanged worldwide.
Tapered roller bearings are mainly used to bear combined radial and axial loads, mainly radial loads. Compared with angular contact ball bearings, the bearing capacity is large and the limit speed is low. Tapered roller bearings can withstand axial load in one direction and can limit axial displacement of the shaft or housing in one direction.