These bearings are used in these rolling mills, where significant reductions in the section of the material to can be obtained at each pass, by transmitting very high pressure between the working rolls and the different rows of back up rolls rolls that support them.
The main characteristics of these soccald "shoulder" bearings are:
large thickness of the outer ring, accompanied by a high degree of finish to respect the surface of the work rolls;
different internal geometries with multiple rows of rollers guided by solid brass comb-milled cages and staggered cavities for an optimized arrangement of the rollers, in such a way as to achieve the maximum radial load capacity.
However, these bearings can also be supplied without a cage or with integral “shoulders” with the outer ring and cataloged depending on precision class, which usually have section tolerances generally included in 10 µ (microns).