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 |

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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