FREQUENT Q/A

How are the grades of bearings divided?

SINO BEARINGSJul 05, 2022

Bearing accuracy is mainly divided into dimensional accuracy and rotation accuracy. The accuracy level has been standardized, divided into P0, P6, P5, P4, P2 five levels.

Accuracy increases from level 0, which is sufficient for general use, but requires level 5 or higher for special conditions or applications.

Chinese bearing former code precision grade code

The standards developed by various countries are based on ISO standards, which are generally consistent with ISO and strictly stricter than ISO standards. Accuracy is divided into dimensional accuracy and rotation accuracy. It is divided into grade 0, 6X, 6, 5, 4 and 2.

Chinese bearing old code standard is :G (class 0), E (class 6), D (class 5), C (class 4), B (class 2). The current code generally uses the German DIN standard.

P0 (class 0), P6 (class 6), P5 (class 5), P4 (class 4), AND P2 (class 2).

General standard grade P0, reflected in the bearing model is omitted, only P6 or above, grade code appears in the bearing model.

By CINDY · Bearing design & application specialists

This article is prepared by the SINO BEARINGS (Sinoti Tech) engineering team, based on published bearing standards (ABEC / ISO P0–P2), material datasheets, and field application experience across industrial, food, medical and aerospace uses. For manufacturer background, certifications and facilities, see our About page.

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