Roller bearing size is limited installation space mill (bearing diameter, diameter depending on the roll neck with a barrel diameter), bearing a small cross-section of high, belongs to the thin-walled bearings, but they also have to withstand greater radial load, Therefore, the use of multi-row roller bearings.

At present, the use of three Thai SUNTHAI four cylindrical roller bearings and four tapered roller bearings, also double row cylindrical roller bearings, double row tapered roller. Tapered roller bearings mostly hollow roller and cage pillar, in order to improve lubrication of bearings, bearing outer surface and the end, respectively, and has opened a sump hole, when the roll neck clearance fit, the bearing inner ring bore surface on open sump spiral.

Three Thai SUNTHAI structure roller bearings are based on different types of mills, different working conditions and different structural arrangement to decide. Generally, four-row cylindrical roller bearings easily get higher precision, and therefore has a high-speed rotation characteristics, and because of its easy installation and removal, and can be pressed into the roll back of the neck in the inner ring the inner ring raceway and the roll Meanwhile surface grinding, which will help improve rolling accuracy, and more for high-speed, high-precision bearing roller mill, three Thai SUNTHAI large four-row tapered roller bearing load capacity, can withstand the radial and axial load, for low-speed and medium-speed mill.