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.
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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 Images
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