The accuracy grade of the bearing is usually divided into P0, P6, P5, P4, and P2 according to the ISO grading standard, and the grade is increased in turn
。 Here are the various accuracy classes and their applications in different fields:

P0 (Normal)
        Accuracy range: Typical run-out error is 10-18 μm in radial direction and 20-40 μm in axial run-out error.
        Application scenario: It is generally used in mechanical equipment that does not require particularly high precision, such as the speed change mechanism and feed mechanism of ordinary machine tools, the speed change mechanism of automobiles and tractors, and the rotation mechanism of general machinery such as ordinary motors, water pumps and agricultural machinery

。

P6 (General Precision)

Accuracy range: The accuracy is improved compared to the P0 class, with a runout error of 5-10 μm in the radial direction and 10-20 μm in the axial runout error.
    Application scenario: It is suitable for industrial equipment, automobile parts, etc., which have certain requirements for accuracy, and is often used in some occasions with high speed but not extremely strict accuracy requirements, such as power tools, general precision measuring instruments, etc

。

Class P5 (Precision)

Accuracy range: It belongs to the precision bearing grade, the radial runout error is 3-5μm, and the axial runout error is 7-10μm.
    Application scenario: It can be applied to machining equipment with general precision requirements, and can meet the needs of most precision spindles, such as ordinary precision machine tools, wind turbines, etc

。

P4 (High Precision)

Accuracy range: It has high accuracy, with a radial runout error of 2-4μm and an axial runout error of 5-7μm.
    Application scenario: It is often used in CNC machine tools, aviation equipment, precision instruments and other fields with high precision requirements, which can ensure the high-precision operation of the equipment

。

P2 (ultra-high precision grade)

Accuracy range: Bearings with the highest accuracy class with a radial run-out error of 1-2 μm and an axial run-out error of 2-5 μm.
    Application scenarios: Mainly used in occasions with very strict error requirements, such as key transmission components in aerospace, precision rotating mechanisms in high-end medical equipment, ultra-precision machining machine tools, etc.