Deep groove ball bearing consists of four basic parts, which are an inner raceway, an outer raceway, steel balls and a cage. It has a simple structure, non-split inner ring and outer ring and easy to be used so it is widely used in machinery industry such as precision meter, low noise electric motor, automobile, motorcycle, woodworker, transmission shaft of textile machinery, mining machinery, electromechanical equipments, plastic machinery, office equipments, medical equipments, fitness equipments, national defense industry, aeronautic industry, aerospace industry, excise equipments and other general machinery.