This bearing is a quintessential example of an inch-series, precision miniature deep-groove ball bearing. Manufactured from high-quality bearing steel, it provides reliable rotational support within the extremely confined spaces of precision machinery. Adhering to inch-based standards for its core dimensions, it features an inner diameter (d) of 0.0781 inches (1.984 mm) and an outer diameter (D) of 0.250 inches (6.35 mm); this ultra-compact design ensures exceptional performance in applications such as miniature sensors and precision medical instruments. In terms of performance, the bearing boasts robust basic dynamic (0.234 kN) and static (0.058 kN) load ratings, enabling it to effectively withstand the radial forces generated during the operation of micro-scale devices.
Bearing Features
Benefiting from a precision-engineered internal raceway design and high-standard manufacturing processes, this product demonstrates exceptional high-speed potential. Under grease lubrication, its limiting speed reaches 68,000 RPM, while under oil lubrication, this figure soars to an impressive 79,000 RPM. These characteristics—combining high rotational speed with minimal wear—make it widely applicable in fields ranging from aerospace modeling and high-precision instrumentation to miniature electric motors. Furthermore, the product not only minimizes frictional resistance during mechanical operation but also effectively isolates external contaminants through an optimized sealing structure (such as ZZ dust shields), thereby ensuring long-term stable operation and an exceptionally low maintenance rate, even under complex working conditions.
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 | R1-4 | ZZ | 0.0781 | 1.984 | 0.25 | 6.35 | 0.296 | 7.518 | 0.0938 | 2.381 | 0.023 | 0.584 | 0.1406 | 3.572 | 0.031 | 0.787 | 0.0039 | 0.1 | 0.284 | 0.098 | 7.9 | 8.9 |

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.
Angular contact ball bearings are essential for handling combined loads because their inner and outer raceways are offset along the bearing axis. This built-in contact angle creates a direct, uninter...
View MoreIn a special production environment, many stainless steel bearings are equipped with corresponding sealing devices. On the one hand, it keeps the grease (oil) inside the stainless steel bearing from b...
View MoreUnder normal circumstances, stainless steel bearings will produce a certain amount of noise during machine operation. However, if the vibration level of stainless steel bearings increases significantl...
View MoreStainless steel bearings offer numerous advantages not only due to stringent manufacturing processes and precision requirements, but also because of the superior quality of the material itself. When s...
View More