What is the primary purpose of thrust ball bearings?

Thrust ball bearings are specifically designed to support axial loads, which are forces that are applied parallel to the axis of rotation. Their primary function is to accommodate these axial forces, allowing for smooth rotation while minimizing friction. This design makes them particularly effective in applications where there's a significant amount of axial load, such as in automotive applications or rotary tables.

While counteracting radial force, facilitating rotation under extreme conditions, and supporting heavy loads are important characteristics in various types of bearings, these are not the primary focus of thrust ball bearings. Radial forces, for example, are typically managed by different bearing types, like radial ball bearings. Thrust ball bearings, by design, excel in managing axial forces specifically, which is why that option is the correct focus.