Angular-contact ball bearings are designed to support combined radial and axial loads or heavy axial loads, depending on the magnitude of the contact angle. An illustration of an angular-contact ball bearing and its contact angle is shown in Fig. 2.7. Angular contact bearings are commonly used in gearboxes, pumps, electric motors, and clutches and other high-speed applications. Bearings having larger contact angles can support larger axial loads, and the contact angle does not usually exceed about 40 degrees. The ratio of the inner and outer raceway radii to ball diameter resides between 0.52 ≤ f ≤ 0.54.