According to the number of rolling rows, tapered Roller Bearings were classified into:

1. single-row tapered roller bearing, 
2. double-row tapered roller bearing
3. four- row tapered roller bearing.
4. Inch tapered roller bearing

Applications:

Tapered roller bearings are used in back-to-back pairs so that axial forces can be supported equally in either direction.
Pairs of tapered roller bearings are used in car and vehicle wheel bearings where they must cope simultaneously with large vertical (radial) and horizontal (axial) forces. Applications for tapered roller bearings are commonly used for moderate speed, heavy duty applications where durability is 
required. Common real world applications are in agriculture, construction and mining equipment, 
axle systems, gear box, engine motors.