Bearings, within the Power Transmission category, are crucial mechanical components designed to reduce friction between moving parts within machinery. These devices support and guide rotating or sliding elements, such as shafts or wheels, allowing them to move smoothly and efficiently. Bearings come in various types, including ball bearings, roller bearings, and needle bearings, each tailored to support different loads, speeds, and operational conditions. Bearings are essential in almost all machinery with moving parts, playing a pivotal role in enhancing the performance and extending the lifespan of equipment. They are used in a wide range of applications, from automotive engines and aerospace equipment to household appliances and industrial machinery, ensuring reliability and precision in motion.