Miniature bearing is a kind of ball bearing, including metric series, English series, flange series and so on. The products have the characteristics of small friction coefficient and high limit speed. The main materials are carbon steel, bearing steel, stainless steel, plastic, ceramic and so on. Suitable for all kinds of industrial equipment, precision instruments, micro-motors, medical instruments and other fields of high speed and low noise, is the most widely used in the mechanical industry.