How to distinguish bearing precision? Bearing tolerance class


[middle bearing net] 2021/1/4 Author: Zhongqian bearing net


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


Grade 0: it is generally used for bearing systems with rotating precision over 10 microns, and it is widely used. For example, the speed regulating mechanism on the ordinary CNC lathe, the tool walking mechanism, the speed regulating mechanism of the car, the speed regulating mechanism of the large tractor, the rotating mechanism of the general chemical machinery such as motor, centrifugal pump and agricultural machinery.


Level 6 and level 5: in precision bearing systems with rotation accuracy of 5-10 microns or high speed, such as common bearings of CNC lathe (Level 5 of front support point and 6 level of rear support point), more precise instrument equipment, instrument panel and its instruments, instrument panel and precision rotating mechanism.


Level 4 and level 2: in super meters, such as precision coordinate milling machine, transmission gear system software of precision grinder, such as instrument, instrument panel and high-speed camera, the rotation accuracy shall not exceed 5 microns and the speed is relatively high. The old code precision grade code of Chinese bearing before.


The international standards are formulated in accordance with ISO standards, which are generally unified with ISO, and some are relatively strict.


Accuracy is divided into specification accuracy and rotation accuracy. It can be divided into 0 degrees, 6x degrees, 6 degrees, 5 degrees, 4 degrees and 2 degrees.


The previous bearing code in China was defined as: grade g (0), class E (6), grade D (5), class C (4), class B (2). The current standard code generally adopts DIN specification of Germany.


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


For example: 6205 and 6205/p5, where 6205 has an accuracy level of P0, but is omitted. This introduces you, P0 grade is the image of the bearing of accuracy grade.


In addition, the different precision bearings are separated in the process of processing and different in use value. For example, the use value of HRB bearing in China is 1.5 times of P6, twice of P5, twice of P4, twice of P5 and 2.5 times of P5.


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