A hardened bearing assembly has an inner and an outer race and a plurality of rolling bearing elements between the inner and outer races. The inner and the outer races each have a respective opposing retaining face dimensioned for an interference fit one about the other so that the bearing assembly may be assembled into an integral bearing assembly by providing an assembly force to one of the races for driving the opposing retaining faces past an interference fit position to a position in which each race rotates freely with respect to the other. The retaining face of one race includes a radially protruding ridge, and the corresponding retaining face of the other race includes a plurality or radially protruding ears, the ridge and the ears each extending to peaks which are pushed past each other for providing the interference fit. The interference fit dimension is larger than the dimensional tolerance for a relatively low-precision manufacturing process, such as metal stamping. Snap-together bearings having a Rockwell C hardness of sixty or more are thus manufactured without precision machining or grinding. Roller structures, such as wheels, and hinge structures using such bearings are shown, and a method of manufacturing small hardened bearing assemblies is described.