A bearing fastening ring used in rotating electrical machines that is able to receive bearings of several diameters when the ring is positioned over a shaft. The bearing fastening ring includes a semi-circular element, scaling profiles of different diameters to accommodate different sizes of bearing, grounding ring apertures in the semi-circular element, cover assemblies extending out from the outer diameter of the semi-circular element, and bracket assemblies extending out from the outer diameter of the semi-circular element.