How to distinguish bearing accuracy?

The key of bearing tolerance grade is to determine the rotation accuracy of the shaft to the support point.

Class 0: Generally used for rotating accuracy of more than 10 microns bearing system, very common application. For example, the speed regulating mechanism on the ordinary CNC 

lathe, the cutting mechanism, the speed regulating mechanism of the car, the speed regulating mechanism of the big tractor, the general chemical machinery such as motor, centrifugal pump and the rotating mechanism of agricultural machinery.

Class 6 and Class 5: In precision bearing systems with rotating accuracy of 5-10 microns or higher rotating speed, such as bearings commonly used in CNC lathes (front support point 5, rear support point 6), more fine instruments and equipment, dashboards and their instruments, dashboards and precision rotating mechanisms.

Level 4 Level 2: In super instruments, such as coordinate milling machines, fine grinding machine transmission gear system software, such as instruments, dashboards and high speed cameras, rotation accuracy does not exceed 5 microns, relatively high speed. Previous old code of Chinese bearing precision grade code.

International norms are formulated in accordance with ISO standards, generally are unified with ISO, some are more strict.

Accuracy is divided into specification accuracy and rotation accuracy. It's 0 degrees, 6X degrees, 6 degrees, 5 degrees, 4 degrees, 2 degrees.

The previous bearing code regulations in China are: Class G (0), Class E (6), Class D (5), Class C (4), Class B (2). The current standard code generally uses the German DIN specification.

(a)P0(0),P6(6),P5(5),P4(4),P2(2) level (2). The common specification grade P0 is omitted from the bearing type specification, and only the grade P6 or above will appear in the bearing type specification.

For example: 6205 and 6205/P5, where 6205 has an accuracy level of P0 but is omitted. In this way, to introduce you, P0 level is not accurate grade bearing image.

In addition, various precision bearings are separated differently in the processing process and different in the use value. For example: the use value of Chinese HRB bearings, the accuracy is 1.5 times of P6, 2 times of P5, 2 times of P4, 2 times of P5, 2.5 times of P5.