Why Do Rolling Bearings Need to Be Preloaded? What Is the Correct Preload Operation Method?
Rolling bearings need to be preloaded to eliminate internal clearance, improve rotational accuracy, increase rigidity, reduce vibration, extend bearing life, and prevent bearing loosening during operation. Preload ensures that rolling elements maintain constant contact with raceways, allowing stable, high-performance function in CNC machines, motors, and precision equipment. The correct preload operation methods include axial adjustment, spring preload, spacer grinding, and the use of matched preloaded bearing sets—each chosen based on application type and performance requirements.
