As an important part of the machinery manufacturing industry, the quality and performance of bearing products directly affect the normal operation and service life of machinery and equipment. Therefore, the establishment and implementation of unified international standards is of great significance for improving the overall level of the industry and promoting international trade and technical exchanges. The following will introduce several main international standards of the bearing industry and their specific content and scope of application.

1. ISO 15554-1: Symbol system of rolling bearings

Content: This standard stipulates the symbol system of rolling bearings, including the representation methods of bearing type, size series, inner diameter size, accuracy grade, and clearance grade. Through a unified symbol system, it is more intuitive and accurate to describe and identify bearings, facilitating procurement and use.

Scope of application: Applies to all types of rolling bearings, including but not limited to cylindrical roller bearings, deep groove ball bearings, angular contact ball bearings, etc.

2. ISO 15554-2: Inner and outer diameter sizes of rolling bearings

Content: This standard defines the tolerances of the inner and outer diameters of rolling bearings, as well as their relationship with the bearing type, size series, and accuracy grade. These size tolerances ensure the precise fit of the bearing during installation and use.

Scope of application: Applies to all types of rolling bearings, aiming to ensure that the bearing maintains a good fit during assembly and use.

3. ISO 15554-3: Accuracy grades of rolling bearings

Content: This standard defines the accuracy grades of rolling bearings, including radial clearance and axial clearance, as well as their influence on bearing performance. The classification of accuracy grades helps users choose the appropriate bearing according to actual needs to meet the requirements of different application scenarios.

Scope of application: Applies to all types of rolling bearings, aiming to ensure the consistency of bearing performance in various application scenarios.

4. ISO 15554-4: Clearance grades of rolling bearings

Content: This standard defines the clearance grades of rolling bearings, including radial clearance and axial clearance, as well as their influence on bearing performance. The classification of clearance grades helps users choose the appropriate bearing according to actual needs to meet the requirements of different application scenarios.

Scope of application: Applies to all types of rolling bearings, aiming to ensure the consistency of bearing performance in various application scenarios.

5. ISO 15554-5: Fit grades of rolling bearings

Content: This standard defines the fit grades of rolling bearings, including the fit between the inner ring and the shaft neck, and the fit between the outer ring and the housing bore. The classification of fit grades helps users choose the appropriate bearing according to actual needs to meet the requirements of different application scenarios.

Scope of application: Applies to all types of rolling bearings, aiming to ensure the consistency of bearing performance in various application scenarios.

The establishment and implementation of these international standards not only help to improve the quality and performance of bearing products, but also promote the standardization and normalization of the global bearing industry, making an important contribution to the advancement of the global machinery manufacturing industry.