These are roller bearings, where the rolling elements are tiny cylinders rather than the balls seen in ball bearings. It maximizes the distribution of stress characteristics at the point of contact by using line contact between the rolling elements and the raceway.
This contract indicates that cylindrical roller bearings have a very high radial load rating. They can also transmit a limited amount of axial load, depending on the construction. Applications for cylindrical roller bearings include mining, transportation, power generating, and metal recycling.
