Tapered roller bearings are separable bearings, bearing inner, outer ring has a tapered raceway. This kind of bearing in the roller number of rows into single row, double row and four row tapered roller bearings of different structure types. Single row tapered roller bearings can bear radial load and axial load in one direction. When the bearing radial load, will produce an axial force, so when you need another bear the reverse direction to balance the axial force bearing.