Angular contact ball bearings are a type of precision bearing designed to handle combined radial and axial loads, commonly found in machinery and mechanical systems. They are constructed with inner and outer raceways and a set of balls held in place by a cage. The inner and outer raceways are designed at an angle to each other, typically in a 15°, 25°, 30°, or 40° configuration. The angular contact design allows these bearings to support both radial and axial loads simultaneously, making them suitable for applications where both types of forces are present, such as in machine tool spindles, automotive wheels, and high-speed rotating machinery. Angular contact ball bearings come in single-row, double-row, and four-point contact configurations, each suited for different load and speed requirements. They are known for their high rigidity, low friction, and ability to accommodate high speeds and thrust loads. Additionally, they can be designed with various cage materials and precision tolerances to meet specific application requirements.