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Yuyao Kangtian Bearing Co., Ltd., founded in 1993, is a professional OEM/ODM Bearing Suppliers and High-Precision Machining Parts Company, one of the earliest professional producers of bearings in the Ningbo area, we also undertake all kinds of high-precision machining parts, and processing according to the drawing or sample. The company has been awarded the National Level Three Quality and Safety Standardization Enterprise, Ningbo environmental protection model green enterprise, registered trademarks of "TTBC" and "Hemudu, HMD" (which has been identified as Ningbo's famous brand).

The company relies on many years of professional manufacturing experience and technical foundation, and has passed ISO9001 and ISO14001 mode for product quality control and management, especially in the automobile and motorcycle bearing manufacturing, non-standard bearing as well as CNC machining parts design and development and other aspects of quality advantages. We specialize in High-Precision Machining Parts Company sales, Products are currently exported to more than 20 countries and regions around the world. At the same time, we have long been supporting and producing all kinds of bearings and the machining parts for many world-renowned companies, and have maintained a good cooperative relationship for many years.


  • ISO 14001
  • ISO 9001
  • ISO 14001
  • ISO 9001
  • Work Safety Standardization
  • Invention Patent
  • Environmental Protection Model Factory
  • Ningbo Famous Trademark
  • Ningbo Bearing Association


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Industry Knowledge Extension

How does the choice of bearing material affect its performance and life?
The choice of bearing materials has a crucial impact on its performance and lifespan:
Firstly, the hardness of the material is a core element determining the durability of the bearing. The hardness is not only related to the composition of the material but also closely linked to its processing method. For instance, carbon steel bearings that have undergone special heat treatment can significantly increase their hardness, enabling them to withstand greater loads. However, excessively high hardness may increase the brittleness of the bearing, reducing its impact resistance. Therefore, when selecting bearing materials, it is necessary to strike a balance between hardness and toughness based on actual work requirements and application environments.
Secondly, the rust resistance and corrosion resistance of the material are crucial for the long-term use of the bearing. In some damp or corrosive environments, the bearing material must possess excellent rust resistance and corrosion resistance to ensure stable operation. For instance, stainless steel bearings are widely used in various harsh environments due to their good rust resistance. However, different grades of stainless steel vary in their corrosion resistance. Therefore, when selecting bearing materials, it is necessary to have a detailed understanding of their corrosion resistance and make trade-offs based on chemical substances and humidity in the working environment.
Moreover, the dimensional accuracy and surface quality of the material significantly impact the performance and lifespan of the bearing. High-precision dimensional requirements mean that the processing and assembly of bearing parts must achieve extremely high levels of accuracy to ensure stable performance during bearing operation. Simultaneously, the surface quality of the bearing is also crucial. Defects such as surface roughness, scratches, and cracks can lead to bearing failures during operation. Therefore, advanced processing and detection techniques need to be employed during production to ensure that the dimensional accuracy and surface quality of the bearing meet requirements.
Lastly, the internal structure and carbide distribution uniformity of the material are also critical factors affecting the lifespan of the bearing. The internal structure of the bearing material should be uniform and dense, with no obvious pores or inclusions. The carbide distribution should also be as uniform as possible to avoid performance differences due to tissue inhomogeneity. By optimizing the smelting and processing techniques of the material, the internal structure uniformity and carbide distribution uniformity of the bearing material can be improved, thereby extending the service life of the bearing.
In summary, the choice of bearing materials requires comprehensive consideration of multiple factors such as hardness, rust resistance, dimensional accuracy, surface quality, internal structure, and carbide distribution uniformity. In practical applications, it is necessary to select the most suitable material type based on the specific use and working environment of the bearing and perform appropriate processing and treatment to ensure excellent performance and long lifespan. Additionally, with the continuous development of material science and bearing manufacturing technology, it is expected that more high-performance and long-lasting bearing materials will emerge in the future, providing better support for various industrial applications.