Rolling elements for bearings include balls, needles, and rollers.
Rollers - the roller contour is designed in such a way that in cooperation with the profiled raceway, edge stresses are largely eliminated. The rollers are selected according to the dimensions, diameters and lengths. Roller tolerance depends on the nominal size, diameter or length. Each group of rollers is packed separately, and the package is marked with average variations in the diameter and length of the rollers.