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Roller bearing size by rolling installation space constraints (bearing diameter, outer diameter depending on the roll neck with the barrel diameter), bearing a smaller cross-section high, are thin-walled bearings, but they must also withstand higher radial load, Therefore, use of multi-row roller bearings.
Currently the main use four cylindrical roller bearings and four row tapered roller bearings, but also a double row cylindrical roller bearings, double row tapered roller. Tapered roller bearings are mostly used hollow roller and cage pillars, in order to improve the lubrication conditions, the bearing outer surface and end, respectively, and the hole has opened a tank, when the clearance fit with the roll neck, the bearing inner ring bore surface opened on spiral groove.
Roller bearing structure is based on the different types of mills, different working conditions and different structural configurations to decide. In general, the four cylindrical roller bearings easily get higher precision, and therefore has a high-speed rotation characteristics, but also because of its easy installation and removal, and can be pressed into the roll back of the neck in the inner ring raceway surface and the inner ring of roll surface while grinding, help to improve rolling precision, used for high-speed, high-precision bearing roller mill, four-row tapered roller bearing load capacity, can support radial load and axial load, for low and medium speed mill .
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7204A NSK | 20 | 47 | 14 |
| 7004C NSK | 20 | 42 | 12 |