617/8 678 Minature Deep Groove Ball Bearing 8X12X2.5mm Thin Section Robot Bearing
617/8 678 Minature Deep Groove Ball Bearings 8mm X 12mm X 2.5mm Thin Section Robot Bearings
8mm Bore 678 617/8 Minature Deep Groove Ball Bearing 8 X12X2.5mm Single Row Open Type Rolling Radial Ball Bearing Thin Section Robot Bearing High Performance Bearing
The 678 miniature deep groove ball bearing, with dimensions of 7mm inner diameter × 11mm outer diameter × 3mm width, is renowned for its compact size, high-speed capability, and low noise characteristics.
Bearing Number |
Boundary Dimensions(mm) | Basic Load Rating(N) | Limiting Speed(rpm) | Reference(kg) Weight |
||||||||
| Inner Diameter | Outer Diameter | Width | Chamfer | Dynamic | Static | Grease | Oil | |||||
| d | D | B | B1 | r(min) | Cr | Cor | Non-contact | Wt ≈ | ||||
| 617/3 | ZZ | 3 | 6 | 2 | 2.5 | 0.1 | 242 | 94 | 60000 | 71000 | 0.00020 | |
| 617/4 | ZZ | 4 | 7 | 2 | 2.5 | 0.1 | 222 | 88 | 54000 | 63000 | 0.00028 | |
| 617/5 | ZZ | 5 | 8 | 2 | 2.5 | 0.1 | 217 | 91 | 49000 | 57000 | 0.00032 | |
| 617/6 | ZZ | 6 | 10 | 2.5 | 3 | 0.1 | 465 | 196 | 43000 | 51000 | 0.00065 | |
| 617/7 | ZZ | 7 | 11 | 2.5 | 3 | 0.1 | 555 | 269 | 40000 | 47000 | 0.00067 | |
| 617/8 | ZZ | 8 | 12 | 2.5 | 3.5 | 0.1 | 515 | 252 | 38000 | 45000 | 0.00075 | |
| 617/9 | ZZ | 9 | 14 | 3 | 4.5 | 0.1 | 920 | 465 | 36000 | 42000 | 0.00140 | |
678 Ball Bearings 8X12X2.5mm Specifications & Dimensions
| Universal | 678 |
| Type | Deep Groove Ball |
| Inner/Outer Ring/ Ball Material | Chrome Steel |
| Cage Material | Steel/Nylon |
| CageType | Punching |
| Precision | P0,P6 |
| Inner Dimension d(Ø)(mm) | 8 |
| Outer Dimension D(Ø)(mm) | 12 |
| Width B (or T)(mm) | 2.5 |
| Lubrication | Grease or oil |
| Load Direction | Radial |
| Specifications/Environment | Standard |
| Number of Raceway Ring Rows | Single Track |
| Size Standards | Metric Series |
The 678 miniature deep groove ball bearing is widely used across various specialized fields due to its compact size and high precision. Application areas include:
1. Precision Machinery and Automation Equipment
Suitable for transmission systems and rotating mechanisms, ensuring precise movement and long operational life in equipment.
2. Micro Motors and Stepper Motors
Acts as a core component supporting the rotor or shaft, ensuring stable motor operation. Commonly found in electric tools, household appliances (such as air conditioner motors and washing machine motors), and other devices requiring consistent performance.
3. Electronic Products and Instrumentation
Utilized in hard disk drives, sensors, optical instruments, and other devices that require low noise and high-precision control, contributing to their smooth and accurate functioning.
4. Automotive Industry
Potentially used in small transmission components or auxiliary systems such as seat adjustment mechanisms and steering systems. Particularly valuable in scenarios where compact design is essential.
5. Industrial Support and Aftermarket
Serves as a standard part for maintenance and replacement in mechanical transmission products, meeting the needs of aftermarket support for imported bearings.
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