The DAC-type wheel hub bearing is a double-row angular contact ball bearing consisting of an integral outer ring and two separable inner rings; it is available in various specifications, with or without seals. Installed at the wheel hub of an automotive axle, it serves as a load-bearing and rotating component capable of supporting both axial and radial loads while providing precise guidance, making it a critical part of the vehicle’s load-bearing and rotation system. Depending on the type of rolling elements, these bearings can be classified as angular contact ball bearings or angular contact roller bearings. DAC-type wheel hub bearings are designed with built-in axial clearance, eliminating the need for clearance adjustment during installation.