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. Office and Electronic Equipment
Personal Computers: Used in cooling fans and internal transmission components of
desktops and laptops.
Printers/Copiers: Applied in paper transmission systems and precision mechanical
structures.
Cameras/Air Conditioners: Provides stable support in optical components and compressor
motors.
2. Industrial and Automation Fields
Automotive Components: Utilized in non-core load-bearing parts such as fan blades and
door handles.
Automation Equipment: Includes robotic arms and conveyor belt systems that require
high-precision miniature bearings.
Power Tools: Employed in the motor bearings of devices like drills and angle
grinders, requiring wear resistance and low noise.
3. Household and Consumer Products
Vacuum Cleaners/Fishing Reels: Used in motor transmissions and rotating components for smooth
operation.
Smart Home Appliances: Found in the miniature transmission systems of devices like
robotic vacuum cleaners and smart locks.
4. Special Scenarios
5G Communication Base Stations: Applied in the heat dissipation modules and precision adjustment
devices of base stations.
