This bearing model belongs to the "reinforced" design category within the inch-based miniature series. Although its inner diameter remains identical to that of the R133—holding steady at 0.0938 inches (2.381 mm)—its outer diameter has been expanded to 0.3125 inches (7.938 mm), and its width increased to 0.1094 inches (2.779 mm). This enhanced design endows the bearing with a load-carrying capacity far exceeding that of other products with the same inner diameter; its basic dynamic load rating (Cr) reaches an impressive 0.548 kN, while its basic static load rating (Cor) stands at 0.170 kN, making it ideally suited for applications where space is limited but load requirements are high.
Bearing Features
Manufactured from high-quality bearing steel, this component exhibits excellent shock resistance and hardness stability. Its raceways undergo precision grinding, ensuring high-speed rotational capability—reaching up to 61,000 rpm under grease lubrication—while generating minimal heat during operation. These high-performance specifications allow the bearing to excel in a wide range of applications, including industrial robot joints, high-precision medical devices such as dental handpieces, and professional-grade model aircraft. Its robust structural design, combined with strict tolerance grades, not only enhances the bearing's rigidity but also effectively suppresses runout caused by uneven loading, thereby guaranteeing high-precision power output for the end equipment.
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 | R1-5 | ZZ | 0.0938 | 2.381 | 0.3125 | 7.938 | 0.359 | 9.119 | 0.1094 | 2.778 | 0.023 | 0.584 | 0.1406 | 3.572 | 0.031 | 0.787 | 0.0039 | 0.1 | 0.549 | 0.176 | 6.4 | 7.2 |

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