What is ABEC?
ABEC is the acronym for the Annular Bearing Engineers Committee, the standards committee of the American Bearing Manufacturers Association (ABMA). The ABMA is the organization that set the grades of bearing tolerance accuracy. Higher ABEC level means greater accuracy for bearing dimensions and internal runouts in the manufacturing processes. This dimensional control includes tolerances for outside diameters, inside diameters, width, and various runouts within the bearing. ABEC grade does not control roundness, raceway smoothness, or noise performance.
