This product series is developed based on the Imperial standard inner diameter of 9.525 mm (0.375 inches) and is positioned for medium-to-heavy-duty transmission applications within precision machinery. As a core component among Imperial-sized miniature bearings, this series is manufactured from high-grade bearing steel through a fully precision-machined process; its internal raceways undergo super-finishing treatment to minimize friction coefficients and enhance wear resistance. Characterized by a robust structure, it serves as an ideal complementary component for high-performance power modules and transmission shafts.
Bearing Features
Thanks to their excellent fatigue strength and rotational geometric precision, these bearings are widely utilized in massage equipment, fitness machinery, industrial transmission systems, and precision woodworking machinery. In these application environments—where bearings frequently face alternating rotational directions or continuous operation under high temperatures—this series leverages its superior thermal treatment stability and long-life lubrication design to ensure the trouble-free operation of mechanical systems even under harsh conditions, thereby enabling end products to achieve higher levels of durability.
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 | R6 | ZZ | 0.375 | 9.525 | 0.875 | 22.225 | 0.969 | 24.613 | 0.2188 | 5.556 | 0.062 | 1.575 | 0.2812 | 7.144 | 0.062 | 1.575 | 0.0157 | 0.4 | 3.33 | 1.42 | 2.1 | 2.3 |
| - | R1038 | ZZ | 0.375 | 9.525 | 0.625 | 15.875 | - | - | - | - | - | - | 0.1562 | 3.969 | - | - | 0.0059 | 0.15 | 0.853 | 0.431 | 2.6 | 2.9 |

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