Each contractor are cross section for the ball perimeter one third about one of the type of the ferrule for rolling to the heart ball bearings, suitable for precision instruments, low noise machine, automobile, motorcycle, general machinery and so on, it is the most widely used in mechanical industry of a class of bearing. Simple structure, convenient operation and maintenance. Mainly used to bear radial load, also can withstand the axial load, when bearing radial clearance increase, with angular contact ball bearing performance, can bear the larger axial load. These bearings are small friction coefficient, high speed limit, large size range and diverse forms. Solid and durable, strong commonality and low noise, can be in the running speed operation and easy to install. they are suitable for precision instruments, low noise motor, Automobile ,Motorcycles, and other common machinery, as a widely used type of bearings in machinery industry.Single deep groove ball bearing otherwise sealed type design, can not lubrication and no maintenance. With single and double rows gap with the ball bearings, suitable for heavy work conditions