The R133 bearing is an ultra-miniature inch-series ball bearing developed specifically to meet the demands of ultra-high-speed operation. With an inner diameter of just 0.0938 inches (2.381 mm) and an outer diameter of 0.1875 inches (4.762 mm), it features an exceptionally compact profile. As a high-precision component crafted from bearing steel, this unit achieves remarkable rotational efficiency through rigorous control over the tolerances of its rings and steel balls; according to its technical specifications, its oil-lubricated limiting speed reaches an impressive 108,000 revolutions per minute.
Bearing Features
Despite its diminutive size, this model strikes an excellent balance between load-bearing capacity and structural stability. Its basic dynamic load rating of 0.088 kN is sufficient to handle the lightweight transmission requirements found in precision micromotors, computer peripherals, and high-end audiovisual equipment. Thanks to its deep-groove ball bearing design, it maintains extremely low levels of vibration and noise during high-speed operation—a critical factor for enhancing the signal acquisition accuracy of precision instruments. Furthermore, the product exhibits excellent fatigue strength, maintaining dimensional stability even within environments characterized by continuous, high-frequency operation; it stands as a preferred core component for office automation systems, precision measuring tools, and electronic communication devices.
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 | R133 | ZZ | 0.0938 | 2.381 | 0.1875 | 4.762 | 0.234 | 5.944 | 0.0625 | 1.588 | 0.018 | 0.457 | 0.0938 | 2.381 | 0.031 | 0.787 | 0.0039 | 0.1 | 0.186 | 0.059 | 9.2 | 10.4 |

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