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The fatigue load limit Cu for single and double row deep groove ball bearings as well as single and double row angular contact ball bearings, are listed in the product tables for all our bearing types.
The nominal maximum stress values that cause such damage may be much less than the strength of the material typically quoted as the ultimate tensile stress limit, or the yield stress limit. Fatigue occurs when a material is subjected to repeated loading and unloading. If the loads are above a certain threshold, microscopic cracks will begin to form at the stress concentrators such as the surface, persistent slip bands (PSBs), and grain interfaces.