This R8-2RS 1/2x1-1/8x5/16-inch sealed single-row ball bearing supports typical radial loads. The bearing's inner and outer rings are made of zirconium oxide ceramic for low friction, high hardness, density, and shock tolerance, and resistance to chemicals, heat, and fracturing. It is has polytetrafluoroethylene (PTFE) seals on both sides of the bearing to keep lubricant in and contaminants out. Zirconium oxide ceramic bearing balls provide low friction, high hardness, density, and shock tolerance, and resistance to chemicals, heat, and fracturing. The bearing has a polytetrafluoroethylene (PTFE) cage for resistance to chemicals, moisture, and high temperatures. This sealed single-row ball bearing is suitable for use in applications that involve combined radial and axial loads and a need for high running accuracy at high rotational speeds. Such applications include clutches, drives, gearboxes, compressors, pumps, turbines, and printing and textile machines, among others.

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.