The R155 is a standard inch-series miniature ball bearing that combines high performance with versatility, featuring an inner diameter of 0.1562 inches (3.968 mm) and an outer diameter of 0.3125 inches (7.938 mm). Its design focuses on optimizing the ball trajectory and contact angle, thereby delivering a dynamic load rating of 0.363 kN while maintaining exceptional dynamic balance. These characteristics—specifically low vibration and low noise—make it a critical component in precision office automation equipment and optical instruments that operate under demanding environmental conditions.
Bearing Features
Constructed from strictly selected, high-grade bearing steel, the R155 ensures superior wear resistance and corrosion resistance; when lubricated with grease, it is capable of reaching rotational speeds of up to 55,000 RPM. Its structural design employs the classic deep-groove ball bearing configuration, enabling it to support not only radial loads but also a certain degree of axial thrust, thereby providing stable guidance for rotating shafts subjected to complex loading conditions. This bearing is widely utilized in massage devices, sports equipment, and various types of miniature motors. Through precision assembly and high-quality grease filling, the R155 achieves long-lasting lubrication while excelling in enhancing mechanical efficiency and minimizing energy loss. Whether meeting the demands of continuous high-frequency operation or the precision requirements of rapid start-stop cycles, this bearing consistently delivers high-quality performance.
Technical Specifications
| Bearing Reference | Boundary Diameters | Basic Dynamic | Basic Static | Limiting Speeds | ||||||||||||||||||
| Flange | Open | Shield | d inch |
d mm |
D inch |
D mm |
Df inch |
Df mm |
B inch |
B mm |
Bf inch |
Bf mm |
B1 inch |
B1 mm |
Bf1 inch |
Bf1 mm |
rsmin inch |
rsmin mm |
Cr kN |
Cor kN |
Grease | Oil |
| F | R155 | ZZ | 0.1562 | 3.969 | 0.3125 | 7.938 | 0.359 | 9.119 | 0.1094 | 2.778 | 0.023 | 0.584 | 0.125 | 3.175 | 0.036 | 0.914 | 0.0039 | 0.1 | 0.363 | 0.147 | 5.5 | 6.2 |

Jiangsu Yinghong Transmission Technology Co., Ltd. (YHU) was established in 2024 through the joint investment of Dongguan Yinghong, Linqing Boshuo, and Yancheng Jiwei. As a group-based enterprise specializing in the research, development, manufacturing, and service of transmission products, we leverage extensive industry experience and strong technical expertise to provide reliable, energy-efficient transmission solutions for customers worldwide.
The company covers more than 70 mu of land and operates nearly 10,000 square meters of manufacturing facilities. As a professional manufacturer of precision special bearings in China, we have introduced advanced Japanese precision manufacturing technology and equipped our facility with automated production lines and high-precision testing equipment. A comprehensive quality management system ensures consistent product quality and reliable performance.
As a National High-Tech Enterprise, Yinghong holds multiple invention and utility model patents and has obtained internationally recognized certifications including IATF 16949, RoHS, CE, and SGS. These certifications enable us to meet diverse customer requirements and provide effective solutions for demanding applications and complex technical challenges.
We specialize in the production of high-precision deep groove ball bearings and custom non-standard bearings under our registered trademark, “YHU”. Our main products include bearing steel bearings, stainless steel bearings, ceramic bearings, and plastic bearings.
YHU bearings are designed to deliver low noise, low vibration, low friction, high precision, great sealing performance, and high-speed operation. They also offer self-lubrication, corrosion resistance, rust resistance, acid and alkali resistance, chemical resistance, electrical insulation, non-magnetic properties, high-temperature resistance, low-temperature adaptability, and long service life, making them suitable for demanding operating environments.
Our bearings and bearing assemblies are widely used in electric motors, power tools, pneumatic tools, robotics, drones, household appliances, precision instruments, semiconductor equipment, medical devices, marine equipment, aerospace applications, financial equipment, textile machinery, fishing equipment, and a wide range of specialized industrial equipment.
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