In summary, the key differences between spherical roller bearings and cylindrical roller bearings lie in their design, load-carrying capacity, misalignment compensation, and application specificity. Each type of bearing is tailored to meet specific operational requirements and environmental conditions in diverse industrial applications.

   - Needle Roller Bearings: Needle roller bearings are commonly used in applications where space is limited, and high radial load-carrying capacity is essential. They are often found in automotive, aerospace, and industrial applications where compact and lightweight bearing solutions are required.

   - Ball Bearing: Ball bearings, including deep groove ball bearings, utilize spherical balls as rolling elements that move between inner and outer raceways. They are primarily designed to support radial loads, with some designs capable of handling limited axial loads. Ball bearings are commonly used in applications where smooth and efficient rotation is required, such as in electric motors, pumps, and gearboxes.