How to distinguish the bearing accuracy? Bearing tolerance class

The key of bearing tolerance grade is to be determined according to the provisions of the rotation accuracy of the shaft to the support point.

Level 0: Generally used for bearing systems with a rotation accuracy of more than 10 microns, and the application is very common. For example, the speed regulation mechanism of ordinary CNC lathe, the knife mechanism, the speed regulation mechanism of cars, the speed regulation mechanism of large tractors, and the rotating mechanism of ordinary chemical machinery such as motors, centrifugal pumps and agricultural machinery.

Level 6 and 5: In precision bearing systems with high rotation accuracy of 5-10 microns or high rotation speed, such as common bearings for CNC lathes (front support point level 5, rear support point level 6), finer instruments and equipment, instrument panels and their instruments, instrument panels and precision rotating mechanisms.

Level 4, level 2: in the super meter, such as fine coordinate milling machine, fine grinding machine transmission gear system software, such as instrumentation, instrument panel and high-speed camera, the rotation accuracy is not more than 5 microns, the speed is relatively high. Chinese bearing before the old code precision class code.

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

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

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

(a)P0(0),P6(6),P5(5),P4(4),P2(2) class (2). Ordinary specification grade P0, reflected in the bearing model specification is omitted, only P6 or P6 above grade, grade code appears in the bearing model specification.

For example: 6205 and 6205/P5, where the accuracy level of 6205 is P0, but omitted. In this way, I would like to introduce to you the image of P0 grade bearing.

In addition, various precision bearings are separated differently in the processing process and are also different in use value. For example, the use value of HRB bearings in China has an accuracy of 1.5 times that of P6, 2 times that of P5, 2 times that of P4, 2 times that of P5, and 2.5 times that of P5.