Four row tapered roller bearing is specially designed for rolling mill applications where their thin cross-section height and increased width provide higher capacity. The difference between a TQO bearing and a 2TDIW bearing design are relatively minor, as each uses two TDI cones.Four row tapered roller bearing utilize conical rollers and raceways, arranged so that the rollers and raceways meet at a common apex. The rollers are guided by contact between the large end of the roller and a rib on the inner ring. This provides high capacity for radial and single thrust loads.