Multi row cylindrical roller bearings, also known as multiroll, are made up of two parts: inner ring (L) and outer assembly (R), which includes outer rings, cage and four rows of rollers. They are mainly used in rolling mill stands, where they are subjected to very high radial loads and impacts combined with medium-low speeds. BUT multiroll bearings are manufactured in different executions, to suit a wide range of applications and environments, above all in the harsh conditions of the steel and aluminium industry.