**Selection and Application of High-Precision Imported Bearings** Home > Bearing Knowledge > Selection and Application of High-Precision Imported Bearings *Source: Bearing Network | Date: August 5, 2014* --- High-precision bearings are essential components in various high-performance machinery and equipment. These bearings are designed to provide superior rotational accuracy, dimensional precision, and minimal surface roughness. In China, bearings classified as P4 grade or higher are considered high-precision, with P2 grade being even more precise. These standards align with international norms such as ABEC 7 and ABEC 9 in the U.S., and ISO P4 and P2 globally. Many countries, including Japan, Germany, and France, recognize and adopt these international standards. While all types of rolling bearings can be manufactured to meet high-precision requirements, certain designs are more commonly used in precision applications. Angular contact ball bearings are widely utilized in high-precision spindles, especially in metal-cutting machine tools that require both high rigidity and accuracy. Double-row short cylindrical roller bearings are also frequently used in such applications, followed by tapered roller bearings. With advancements in bearing manufacturing technology, the actual performance of fine bearings often exceeds expectations. For example, the roundness of machine tool ball bearings typically reaches 0.3 μm, while computer spindle bearings may achieve even better precision, such as 0.25 μm. When selecting high-precision bearings for a specific application, it is advisable to start with the three most common types mentioned above. However, not all standard sizes will have high-precision options available. Therefore, users should consult directly with bearing manufacturers or suppliers to check availability. Generally, P4-grade bearings are more readily available, while P2-grade bearings may need to be custom-ordered or produced on a trial basis. To achieve high-precision spindle support, several key methods are applied: 1. **Selecting high-precision bearings**: Choosing the right type of bearing is crucial for achieving the desired level of accuracy. 2. **Improving accuracy through application techniques**: This includes error cancellation, minimizing interference, and adjusting clearance to enhance positioning and rotational accuracy. 3. **Reducing external influences**: Ensuring proper installation, lubrication, and environmental control helps maintain the bearing’s performance over time. By following these principles, engineers and technicians can ensure that their systems operate with maximum precision and reliability. --- **Related Bearing Knowledge:** - The Chinese die-casting bearing industry is developing under favorable conditions in the new year. - 10 key factors to consider when selecting imported bearings. - Analysis of abnormal sounds in KOYO motor bearings and how to identify bearing issues. - Important operational guidelines for SKF mill bearings. This article was originally published on [China Bearing Network](http://). Please reference the source when sharing this content. Previous: Analysis of Sliding Bearing Damage Next: Key Considerations in Using Variable Speed Bearings

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