The four-row taper roller bearing is a most common radial roll bearing. A bearing with such  structure has a high bearing  capacity and can bear the combined load which is mainly consisted by the radial load. Its radial loading capacity is 2.5 -3.5 times that of a single-row bearing. It can bear both very high radial and axial loads. Compared to a four-row  cylindrical roller bearing, it has a relatively low speed due to the restriction of its structure. The four-row tapered  roller bearing can bear axial loads in double directions, so it can be used as a bidirectional thrust bearing.

The four-row tapoered roller bearings are mainly used in the working roll necks of hot or cold rolling mills, and roll neck of cogging mills. They usually clearance fit with roll necks to being mounted and dismouted conveniently.