Bearing for idler is widely used in cars, rolling mills, mines, metallurgy, plastic machinery and other industries. Bearing for idler is the appearance of scars of equipment in the process of non essential reason is: is there assembled equipment, bearing inner ring and the outer ring is inclined; may appear load equipment and assembling charge into the enemy ranks are in the process, eventually forming a bearing scars. Is bearing for idler to suspend the equipment according to the operating standard, do not constitute a lot of achievements, such as equipment may not when will the raceway surface and rolling bearing surface of the bearing structure of linear scars. Deep groove ball bearing equipment direct response precision, and use the function of bearing life.