Rolling bearings transfer loads between machine components, and support and guide rotating and oscillating machine elements, such as shafts, axles or wheels. Bearings with rolling elements provide high precision and low friction. This enables higher rotational speeds while reducing noise, heat, and energy usage. They are cost-effective, exchangeable, and typically follow national or international dimension standards.
Rolling bearings can be classified into two basic categories based on the types of rolling elements they contain. The main difference lies in how they make contact with the raceways: