The bearing cage for roller bearings has an inner ring, an outer ring, and a plurality of cage bars extending between the inner ring and the outer ring so as to form a plurality of pockets. At least one of the inner ring and the outer ring has a formed ring flange protruding inwardly into the pockets. The pockets have of least one curved end with a radius or a straight end with large radii so that the pockets extend under the ring flange. The formed ring flange provides radial guidance to the ends of the rolling elements, which also aids in reducing the possibilities of stress risers from forming, causing fatigue and ultimately failure of the bearing cage.