The R8 bearing is one of the larger models within the Imperial miniature series, featuring an inner diameter of 12.7 mm (0.5 inches). This bearing is specifically engineered for micro- and small-scale machinery that requires the capacity to bear substantial loads while operating in complex environments. Constructed entirely from high-quality bearing steel, it achieves superior dynamic load limits through the optimization of steel ball diameters and raceway fill ratios.
Bearing Features
Characterized by a robust physical profile, its inner and outer rings—as well as its steel balls—undergo rigorous hardness testing and precision sorting, thereby representing the highest standard of durability within the Imperial miniature series.
This product serves as a critical structural component in heavy-duty power tools, mechanical joints, high-performance model aircraft motors, and precision assemblies within certain agricultural machinery. In these high-intensity applications, the R8 bearing functions not merely to support the rotating shaft, but also to act as a buffer against vibration and a safeguard against mechanical wear. By incorporating low-noise lubricants and precision sealing mechanisms, the bearing effectively reduces the overall operational noise levels of the equipment—thereby enhancing the quality of the finished machine—while simultaneously ensuring the delivery of high-output power.
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 |
| - | R8 | ZZ | 0.5 | 12.7 | 1.125 | 28.575 | 1.2252 | 31.12 | 0.25 | 6.35 | 0.062 | 1.575 | 0.3125 | 7.938 | 0.062 | 1.575 | 0.0157 | 0.4 | 5.11 | 2.41 | 1.6 | 1.8 |

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