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Precision grade and selection of bearing.

Time:2018.01.19  Source:Roller Bearings Suppliers


1. The tolerance level of the bearing is determined according to the rotation accuracy requirement of the axial support.

Level 0: it is widely used in general bearing systems with rotating precision greater than 10 m.Such as the speed change mechanism of common machine tool, the speed change mechanism of feeding mechanism, automobile, tractor, ordinary motor, water pump and agricultural machinery, etc.

Level 6, 5, in the rotating accuracy in 5 to 10 microns or high speed precision bearing system, such as ordinary lathe used bearings (front support with 5 levels, support level 6) after the precision instruments, meters and precision instruments, meters, and the precision of the rotating mechanism.

Level 4,2: in the rotating precision of less than 5 microns or in ultra precision instruments with high speed, such as precision coordinate boring machine, precision grinding machine of the gear system, precision instruments, meters and high-speed cameras and other precision system.


2. Chinese bearing used to be used for the designation of precision grade.

The standards set by each country are formulated in accordance with ISO standards, and are generally consistent with ISO standards.Precision is divided into dimension precision and rotation precision.It is divided into 0, 6X, 6, 5, 4 and 2. 

The old codes of Chinese bearing used are :G (0), E (6), D (5), C (4), and B (2).The current code is generally adopted by the German DIN standard.

P0 (level 0), P6 (level 6), P5 (level 5), P4 (level 4), level 2 (level 2). 

General standard grade P0, the reaction is elliptical on the bearing model, only the P6 or P6 level, the grade code appears in the bearing model. 

For example: 6205 and 6205/P5, of which 6205 has a precision level of P0, but it is omitted.This gives people the impression that the P0 class is non-precision grade bearing. 

In addition, the bearings of all kinds of precision are different in processing technology, and also different in value.For example, the value of famous brand in China, the bearing of P6 precision is 1.5 times of P0, and the bearing of P5 precision is twice as high as P0, and the accuracy of P4 is 2.5 times of the P5.

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