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 |

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