This product series is specifically designed to address requirements for limited space and lightweight construction. Crafted from high-quality bearing steel and manufactured using precision machining processes, these products ensure excellent operational performance even within an extremely thin cross-section. A defining characteristic is the minimal difference between the inner and outer diameters, making them ideally suited for installation in mechanical assemblies where structural compactness and radial space conservation are critical.
Bearing Features
The use of premium bearing steel, subjected to rigorous heat treatment, endows these bearings with exceptional hardness and wear resistance, thereby effectively extending their service life under light-load conditions. Furthermore, the design features—including smaller rolling elements and a lightweight cage—result in extremely low frictional torque during operation, enabling support for high rotational speeds while minimizing heat generation. These bearings are widely utilized in precision applications with strict constraints on size and weight, such as miniature motors, medical devices, optical instruments, robotic joints, precision office equipment, and electronic scanning systems.
Technical Specifications
| Bearing Reference | Boundary Diameters | Basic Dynamic | Basic Static | Limiting Speeds | |||||||||
| Flange | Open | Shield | seal | d(mm) | D(mm) | Df(mm) | B/B1(mm) | Bf(mm) | rsmin(mm) | Cr(kN) | Cor(kN) | Grease | Oil |
| F | 6700 | ZZ | 2RS | 10 | 15 | 16.5 | 3/4 | 0.8 | 0.15 | 0.853 | 0.431 | 2.6 | 3 |
| F | 6701 | ZZ | 2RS | 12 | 18 | 19.5 | 4 | 0.8 | 0.2 | 0.921 | 0.529 | 2.2 | 2.5 |
| F | 6702 | ZZ | 2RS | 15 | 21 | 22.5 | 4 | 0.8 | 0.2 | 0.941 | 0.578 | 1.8 | 2.1 |
| F | 6703 | ZZ | 2RS | 17 | 23 | 24.5 | 4 | 0.8 | 0.2 | 1 | 0.657 | 1.7 | 1.9 |
| F | 6704 | ZZ | 2RS | 20 | 27 | 28.5 | 4 | 0.8 | 0.2 | 1.04 | 0.725 | 1.4 | 1.6 |
| F | 6705 | - | 2RS | 25 | 32 | 34 | 4 | 1 | 0.2 | 1.09 | 0.843 | 1.2 | 1.3 |
| F | 6706 | - | 2RS | 30 | 37 | 39 | 4 | 1 | 0.2 | 1.15 | 0.951 | 1 | 1.1 |

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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