Cylindrical roller bearings are designed to withstand heavy loads. Compared to traditional bearings with cage retainers of the same width, these bearings offer high load capacity, a smaller radial section for space-saving, but a relatively lower rotational speed. To ensure normal bearing operation, under continuous operation, the bearings need to bear a lower load, i.e., C/P < 25. Otherwise, insufficient lubrication and increased wear at high speeds can occur. All multi-row cylindrical roller bearings have a lubrication groove and lubrication hole on the outer ring.