Miniature ( micro rolling ) ball bearing is one kind of ball bearing, and its main components include inner and outer rings and balls. Miniature  ( micro rolling ) ball bearings mainly bear radial loads, but also a certain amount of axial loads. 

Mini. ball bearings have a small coefficient of friction, a high limit speed, and a variety of sizes and forms. It is suitable for precision instruments, low-noise motors, automobiles, motorcycles and general machinery, etc. It is the most widely used type of ball bearing in the machinery industry.