What is the meaning of bearing accuracy grade p4p5? Which grade is higher

P4 bearing has higher dimensional precision and rotation precision than P5 bearing.

The grades of bearings are divided into four levels: po-p6-p5-p4-p2. Po level is the national standard and the most common standard in the bearing industry, so it is also called ordinary level. At present, the vast majority of domestic manufacturers also produce Po level products, and P2 level is the highest precision level! There are also standards for specific technical parameters.

A brief summary is as follows: the accuracy of precision benchmark rolling bearings is divided into (main) dimensional accuracy and rotational accuracy. The accuracy grade has been standardized, which is divided into six grades: grade 0, grade 6x, grade 6, grade 5, grade 4 and grade 2.