Below is a list of Angular Contact Bearings manufacturers from Boston, Massachusetts. Angular contact bearings are rolling-element bearings with asymmetrical axial races that provide smooth motion with low friction. All ball bearings consist of two races, which are the pathways that the balls travel in. The inner race is a circular piece of metal that the balls rest on. It does not move but is fixed in place. The outer race encloses the balls and is able to move freely.