China’s first Ultra-Large, Ultra-High-Precision Bearing developed by LZJM was successfully launched

Luoyang,China,5 November 2026:Recently, a sealed bearing with an OD 5000 mm —featuring ultra-high precision and anti-high and low temperature—developed and manufactured by LZJM successfully rolled off the production line and passed on-site acceptance by a panel of experts on the first attempt. Weighing over 20 metric tons, this bearing is the largest, most precise, and structurally most complex of its kind in China.

As a core component of the rotary system for a major piece of domestic equipment, this bearing must meet the requirements of a large-size bearing—including high precision, high load-carrying capacity, high rigidity, and a specialized sealing structure. The technical requirements are stringent, the manufacturing process is complex, and the demands on materials, heat treatment, precision machining, inspection technology, and assembly and debugging are extremely high. Faced with this “giant” bearing, the company’s project team focused on key challenges—such as its large size, structurally complex design prone to deformation, and the difficulty of precision control—continuously optimizing processes and conducting repeated testing and validation. By overcoming multiple key technical hurdles, the team ultimately successfully completed the machining and assembly of the product. Testing confirmed that the product’s precision meets or exceeds Class P2 standards, with rotational precision ranging from 0.015 to 0.02 mm—significantly surpassing the precision requirements for similar products and filling a domestic technological gap.

Following on-site verification by a panel of experts, all bearing specifications were found to meet design standards and operational requirements, and the bearings demonstrated stable and reliable performance. The successful development of this product has set a new domestic record for bearings of this type and represents a significant breakthrough for LZJM in the field of ultra-large, ultra-high-precision bearings. It has significantly enhanced China’s capacity to independently supply precision bearings for high-end, major equipment and has provided valuable practical experience for the future development of similar precision products.

For further information, please contact:

Sundy Liu ; sundyliu@lzjmbearing.com