Cylindrical roller bearings are a type of rolling-element bearing designed to support high radial loads while allowing for moderate speeds. They consist of an inner ring, an outer ring, and cylindrical rollers guided by a cage, which reduces friction and ensures even load distribution. These bearings come in various designs, including single-row, double-row, and multi-row, to accommodate specific load and speed requirements. Commonly used in industrial machinery, electric motors, and gearboxes, cylindrical roller bearings are valued for their durability, high load-carrying capacity, and ability to handle misalignment and thermal expansion effectively.