The tolerance grade of the bearing is mainly determined according to the rotational accuracy requirement of the shaft to the support.
Grade 0: in the rotary accuracy greater than 10μm in the general bearing system, the application is very wide. Such as general machine tool speed change mechanism, feed mechanism, automobile, tractor speed change mechanism, general motor, water pump and agricultural machinery and other general general machinery in the rotating mechanism.
6, 5, 4 level: in the rotary accuracy of 5-10μm or high speed precision bearing system, such as bearings used in ordinary lathes (the front support with 5 level, the rear support with 6 level) the more precise instruments, instruments, and precision instruments, meters, and precision rotating mechanism.
3, 2, 1 level: in the rotary accuracy of less than 5μm or high speed of ultra-precision instruments, such as precision coordinate boring machine, precision grinding machine gear system, precision instruments, meters, and high-speed camera and other precision systems.
Bearing (Bearing) is an important part of contemporary mechanical equipment. Its main function is to support the mechanical rotating body, reduce the coefficient of friction in the process of its movement, and to ensure its rotary accuracy.