Leveraging the properties of SUS304 stainless steel, R4-series miniature flanged bearings are frequently used in applications such as miniature control valves for seawater desalination equipment and rotor supports for outdoor fountain pumps; they are capable of withstanding both the impact of water flow and corrosion from moisture.
Bearing Features
By precisely controlling the curvature of the internal raceway and utilizing the inherent elasticity of the SUS304 material, these bearings generate minimal heat during high-speed operation, while the flange facilitates heat dissipation into the metal mounting base. In applications involving prolonged exposure to ultraviolet radiation and humid air, the stainless steel material—unlike polymers—does not undergo photodegradation or embrittlement, ensuring the physical integrity of the flanged structure remains consistent over time.
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 | SFR168 | ZZ | 0.25 | 6.35 | 0.375 | 9.525 | 0.422 | 10.719 | 0.125 | 3.175 | 0.023 | 0.584 | 0.125 | 3.175 | 0.036 | 0.914 | 0.0039 | 0.1 | 0.372 | 0.176 | 4.2 | 4.7 |
| F | SFR188 | ZZ | 0.25 | 6.35 | 0.5 | 12.7 | 0.547 | 13.894 | 0.125 | 3.175 | 0.023 | 0.584 | 0.1875 | 4.762 | 0.045 | 1.143 | 0.0059 | 0.15 | 1.08 | 0.441 | 3.5 | 3.9 |
| F | SFR4 | ZZ | 0.25 | 6.35 | 0.625 | 15.875 | 0.69 | 17.526 | 0.196 | 4.978 | 0.042 | 1.067 | 0.196 | 4.978 | 0.042 | 1.067 | 0.0118 | 0.3 | 1.48 | 0.617 | 3 | 3.3 |
| - | SFR4A | ZZ | 0.25 | 6.35 | 0.75 | 19.05 | - | - | 0.2188 | 5.556 | - | - | 0.2812 | 7.144 | - | - | 0.0157 | 0.4 | 2.33 | 0.892 | 2.6 | 2.9 |

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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