Double-row angular contact ball bearing, supporting moderate combined radial and bidirectional thrust loads Ball contact angle of 20 degrees relative to the inner and outer raceways increases thrust load capacity Rubber seals on both sides of the bearing to keep lubricant in and contaminants out Pressed steel cage evenly spaces balls for reduced friction, vibration, and noise Normal axial internal clearance for applications where thermal expansion is not a factor Rolling bearings use rolling elements to maintain the separation between moving parts to reduce rotational friction and support radial and axial loads. These elements can be one of the following types: ball, cylindrical, spherical, barrel, needle, spindle, or tapered. All rolling bearings are open, shielded, or sealed. Sealed bearings are lubricated with oil or grease in the bearing factory, while open and shielded bearings are meant to be lubricated in place, with periodic reapplication of lubrication, based on use. The shield protects the working parts of the bearing from environmental debris that may be introduced and could reduce the ball bearing speed and lifespan. Rolling bearings are used in a range of applications from agricultural machinery to conveying equipment, robotics, dental equipment, elevators, rolling mills, ship rudder shafts, and aggregate crushers, among others.