Tapered roller bearings are mainly used to carry combined radial and axial loads. Their axial load-carrying capacity depends on the raceway angle of the outer ring; the larger the angle, the greater the axial load capacity. Double row and four row tapered roller bearings can carry combined radial and axial loads primarily based on radial loads, and can also accommodate axial loads in both directions. They are generally suitable for medium- and low-speed applications.