Deep groove ball bearings are composed of four basic parts, including inner ring, outer ring, steel ball and cage. Under normal operating conditions, the innerl raceway, the outer raceway and the steel balls bear the load, and the cage separates the steel balls and maintains stability. Single-row radial deep groove ball bearings have simple structure with no separation of inner rings and outer rings, that is easy to use. deep groove ball bearings are the most widely used type ofl bearings in the machinery industry with a wide range of applications such as precision instrument, low-noise motor, automobile,l motorcycle, woodworking machinery, textile machinery, mining machinery, electromechanical equipment, and plastic machinery, office equipment, medical equipment, fitness machinery, national defense industry, aviation, aerospace and sports equipment, general machineryl and so on.