Single-row deep groove ball bearings are the most common type of rolling bearings. Their application is very wide the raceway grooves on both the inner and outer rings have circular arcs of slightly larger radius than that of the balls In addition to radial loads, axial toads can be imposed in either direction Because of their low torque, they are highly suitable for applications where high speeds and low power loss are required In addition to open type bearings. these bearings often have steel shields or rubber seals installed on one or both sides and are pre lubricated with grease Also, snap rings are sometimes used on the periphery Pressed-steel cages are the most common type