Rolling bearings are a general term for rolling bearings that have balls or rollers (cylindrical, tapered, or needle-shaped) positioned between inner and outer rings. Used in rotating parts of machine tools, industrial machinery, conveying equipment, robots, etc., they significantly reduce friction resistance while providing high load capacity. Various types include deep groove ball bearings, cylindrical roller bearings, tapered roller bearings, needle roller bearings, and self-aligning roller bearings, capable of handling radial loads, axial loads, and combined loads. These are essential mechanical components for spindles, feed shafts, rotary tables, etc. in manufacturing lines requiring high-speed rotation, heavy loads, and precision positioning. They have distinctly different structure and function from plain bearings.