The bearing accuracy grade is mainly determined according to the rotational accuracy requirements of the shaft to the support.
In the general bearing system with rotational accuracy greater than 10μm, the application is very wide. Such as ordinary machine tool speed change mechanism, feeding mechanism, automobile, tractor speed change mechanism, ordinary motor, pump and agricultural machinery and other general general machinery in the rotating mechanism.
In the rotary precision in 5-10μm or high speed precision bearing system, such as the bearings used in ordinary lathes (5 levels for the front support, 6 levels for the rear support) more precise instruments, meters and precision instruments, meters, and precision rotary mechanism.
in the rotary accuracy of less than 5μm or speed is very high in the ultra-precision instruments, such as precision coordinate boring machine, precision grinding machine gear system, precision instruments, meters and high-speed camera precision system.
China bearing before the old code accuracy level code countries are based on the development of the ISO standard, generally consistent with ISO, individual strict in ISO standards. Accuracy is divided into dimensional accuracy and rotational accuracy. It is divided into 0 level, 6X level, 6 level, 5 level, 4 level, 2 level. China bearing before the old code standard is: G level (0 level), E level (6 level), D level (5 level), C level (4 level), B level (2 level). The current codes are generally based on the German DIN standard. Class P0 (Grade 0), Class P6 (Grade 6), Class P5 (Grade 5), Class P4 (Grade 4), Class P2 (Grade 2).
General standard grade P0, reaction in the bearing model is omitted, only P6 or P6 level above, the grade code will appear in the bearing model. For example: 6205 and 6205/P5, which 6205 accuracy level is P0 level, only omitted. This creates the impression that the P0 grade is a non-precision grade bearing.
