The difference between needle roller bearings and cylindrical roller bearings lies in their design, load-carrying capacity, and application suitability. Here are the key distinctions between the two types of bearings:

The deep groove in a ball bearing is characterized by a raceway with a deep, concave profile that forms a continuous, circular track for the bearing's rolling elements, typically steel balls. This design feature allows the balls to move freely within the raceway, distributing the load evenly and minimizing friction during rotation. The deep groove also provides space for the lubricant, which helps to reduce wear and heat generation, ensuring the bearing's longevity and reliability.