Tolerance Rings can save your design when mounting ball bearings. These unique circular fasteners can secure and mount ball bearings within housings or to shafts by exerting radial holding forces. A series of equally spaced waves or corrugations formed into their circumference act as springs to retain ball bearings in place. - The amount of compression of these waves, the inherent properties of a particular tolerance ring configuration, and the properties of the mating surfaces determines the holding force strength.