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Bearing from the modern industrial revolution, the bearings have been made into important parts in the mechanical parts. China is one of the earliest countries in the world to invent rolling bearings, in ancient Chinese books, the construction of axle bearing is recorded. Bearing is the important foundation of all kinds of machinery and equipment parts and components, its accuracy, performance, life and reliability of the accuracy, performance, life and reliability of the host plays a decisive role. In mechanical products, the bearings are high precision products, not only need comprehensive support the theory of mathematics, physics, and many other disciplines, but also need to material science, heat treatment technology, precision machining and measuring technology, numerical control technology and effective numerical method and the powerful computer technology in many disciplines, such as services, thus bearing is a product on behalf of the state science and technology strength.
After the founding of new China, under the strong push of reform and opening to the outside, bearing industry in China has entered a brand new high quality fast development period and has achieved from small to large, from weak to strong development strategy, form the basic layout reasonable, medium enterprises coexist, relatively complete product categories of relatively complete industrial system. At present, as the country attaches importance to equipment manufacturing and the trend of bearing localization is becoming more and more obvious, the bearing market in China will have a wider development space.
The development of the bearing foundry industry has been developing rapidly, which has a better effect on the stability of the bearing steel market. The current demand for high-end bearing is increased significantly, such as ball screw bearing with precision angular contact ball bearing photovoltaic industry, aerospace bearings, machine tool precision bearings, high speed motorized spindle bearings, turntable bearings, wind power bearing, rolling mill bearings, high-speed bearing, auto bearing, crane pulley bearing, turbocharger bearing, fluid dynamic pressure bearing, etc.
Experience more than 50 years of construction and development of bearing industry in China has achieved a small to big, weak to strong development strategy, form the basic production layout reasonable, medium enterprises coexist, relatively complete product categories of relatively complete industrial system. It also has the capability of production and technical strength. At present, the Chinese bearing industry already has a large economy scale, the national bearing enterprise has more than 1400, the staff is about 300,000 people. In 2011, China's bearings manufacturing industry reached 19.32.11 billion RMB, up 27.59 percent year on year. Sales revenue was 1910.7 billion RMB, up 30.30% year on year. Profits totaled 12.523 billion RMB, up 26.54 percent year on year.
At present, the precision bearing mechanical casting industry has become the basis of the development of the country during the period of "twelfth five-year" key industries, strive to make it at or near the international advanced level. With the support of the policy, sales of high-end bearing foundries are expected to reach 222 billion RMB by 2015. With more than 22 billion bearings, the total sales are expected to exceed 350 billion RMB, making it the world's largest production and sales base for bearings.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| M255449/10 bearing | 288.925 | 406.4 | 77.788 |
| L55249/10 bearing | 292.1 | 374.65 | 47.625 |