Ningbo DOWHON Bearing Co.,LTD manufactures motor-grade precision deep groove ball bearings, focusing on low-noise performance, high precision, and long service life.
Ningbo DOWHON Bearing Co.,LTD specializes in motor-grade precision deep groove ball bearings, covering a wide range of bore diameters from 2 mm to 100 mm. The company develops and manufactures bearings designed for stable, quiet operation, high accuracy, and durability across demanding applications.
With advanced processes, well-equipped production capability, and complete inspection and testing methods, DOWHON implements end-to-end quality control—from raw material stocking and casting-part processing through heat treatment, grinding, and assembly. Its product performance is positioned around low noise and high precision, with accuracy up to P5 and vibration meeting Z3V3 standards.
The company builds and supplies branded bearing lines including VCD, XSHB, and MOS, and its bearings are widely used in micro motors, household appliances, fitness equipment, automotive and motorcycle components, electric tools, instruments, and automation equipment. Dedicated life and durability testing supports continual improvement in bearing longevity and reliability.
Quality control is managed throughout the full production journey, including raw material stocking, casting-part processing, heat treatment, grinding, and final assembly, supported by complete inspection and testing methods.
Product accuracy can reach P5, and vibration performance meets Z3V3 standards, supporting quiet, stable operation in motor-grade applications.
A dedicated bearing life testing approach is used to evaluate service life and durability, including continuous running tests under set radial and axial loads and high rotational speed, followed by teardown analysis.
The VCD line is positioned for mid- to high-grade deep groove silent bearings, with continued focus on reducing friction through design, lubrication, cage selection, and manufacturing methods.
Seal performance is treated as essential to keeping grease clean and extending overall bearing life by helping block contamination and reduce lubricant leakage.
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