The four main types of bearings are ball bearings, roller bearings, plain bearings, and thrust bearings. Each type is designed to address specific load-bearing requirements and operational conditions in various machines and equipment across different industries.

   - Thrust ball bearings are specifically designed to support axial loads, which are forces acting parallel to the shaft's axis. They are used in applications where the primary load is axial, such as in automotive transmissions, machine tool spindles, and thrust applications.