Full-complement cylindrical roller bearings are designed to withstand heavy loads. Compared to traditional bearings with cage retainers of the same width, they offer a high load-carrying capacity, have a smaller radial section for space-saving, but operate at a relatively lower speed. To ensure normal operation, the bearing needs to bear a smaller load under continuous operation, i.e., C/P<25. Otherwise, insufficient lubrication and increased wear at high speeds may occur. All multi-row cylindrical roller bearings are equipped with a lubrication groove and lubrication holes on the outer race.