Angular contact ball bearings are a type of rolling-element bearing that have a contact angle between the balls and raceways that allows them to support higher axial loads. Angular contact ball bearings are often used in high-speed and high-precision applications, such as machine tool spindles, pumps, and motors. They are also used in automotive applications, such as wheel bearings and transmissions.

There are several different types of angular contact ball bearings, including single-row, double-row, and four-point contact bearings. Single-row bearings are the most common type and are designed to support radial and axial loads in one direction. Double-row bearings have two rows of balls and can support higher radial loads and axial loads in both directions. Four-point contact bearings are designed to support radial and axial loads in any direction.

Some of the key benefits of angular contact ball bearings include their ability to support high axial loads, their ability to operate at high speeds, their high precision and accuracy, and their relatively low friction. However, they may be more costly than other types of bearings and may require careful mounting and alignment to operate properly.