Ball bearings, or deep-groove bearings, extend the working life of equipment by enabling wheels, pulleys, and other rotating parts to reduce friction and move smoothly. Ball bearings have a series of round balls encased in a housing and support high axial or low-to-moderate radial loads. Axial (thrust) bearings support loads parallel to the axis, such as those exerted by a table supporting a weight. Radial bearings support loads where the force of the load is perpendicular to the shaft, such as those exerted by a rotating wheel. Angular (linear) bearings have two rows of balls set at an angle to one another for use with radial and axial loads. Ball screw support bearings are high-precision angular bearings used to support high loads and restrict axial movement for precise positioning for machining and other ball screw applications. Agricultural disc bearings are used in high-impact industrial applications where the bearing is exposed to high levels of dirt or other contaminants.