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 |

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