Bearing Standards Precision Levels

Equipment with different precision requires bearings with different precision.

The precision is divided into several levels such as p0 < p6 < p5 < p4 < sp < p2. Generally, the accuracy of main bearings requires P5 or above.

P0 level: The rotation accuracy of the bearing system is greater than 10 μm. It is widely used in rotating mechanisms or speed-changing mechanisms in general machinery fields such as ordinary machine tools, automobiles, ordinary motors, water pumps, etc.

P6, P5 level: can be used in precision bearing systems with a rotation accuracy of 5-10 μm or higher rotation speeds, such as front and rear supports for lathes, more precise instruments and meters, precision rotating mechanisms, etc.

P4, P2 level: used in ultra-precision machinery that can achieve a rotation accuracy of less than 5 μm or a higher rotation speed, such as precision coordinate boring machines, precision grinder gear systems, high-speed cameras, and other precision system applications.

Usually, P0 level will be omitted from the bearing model indication, and the grade code of bearings with P6 grade and above needs to be marked in the bearing model. For example: 6205 and 6205/P5, and 6205 bearings are P0 level.

ISO standard bearing accuracy is divided into P0, P6, P5, P4, and P2, from low to high.

There are five mainstream standards for bearing accuracy in the world, namely the Japanese Industrial Standard (JIS), the International Standard (ISO), the German Standard (DIN), the American Standard (ANSI). We also have China Standard, the label is GB307.