617/8 678 ZZ Minature Deep Groove Ball Bearings 8mm X 12mm X 3.5mm
Thin Section Robot Bearings
The 678 ZZ miniature deep groove ball bearing, with dimensions of
8mm inner diameter × 12mm outer diameter × 3.5mm width, is renowned
for its compact size, high-speed capability, and low noise
characteristics.
678 ZZ Ball Bearings 8X12X3.5mm Specifications & Dimensions
| Universal | 678 ZZ |
| 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) | 3.5 |
| Lubrication | Grease |
| Load Direction | Radial |
| Specifications/Environment | Standard |
| Number of Raceway Ring Rows | Single Track |
| Size Standards | Metric Series |
The 678 ZZ 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 Equipment and Electronics
Personal Computers (Desktop/Laptop), Printers, Copiers, ATMs: Used in spindles or transmission components of these devices.
Cameras, Projectors: Employed in the rotating structures of precision optical
equipment.
2. Household Appliances
Air Conditioners, Vacuum Cleaners, Power Tools (e.g., drills, angle
grinders): Utilized in motor or fan components.
Smart Home Devices (e.g., robotic vacuum cleaners): Applied in the drive units of some smart home appliances.
3. Automotive Industry
Electrical Control Systems (e.g., wiper motors, window regulators),
Sensors: Used in miniature mechanical parts within automotive electrical
control systems.
Onboard Electronic Devices (e.g., dashboards, navigation systems): Found in auxiliary transmission structures of vehicle
electronics.
4. Industrial and Precision Instruments
Fishing Reels, Textile Machinery (e.g., sizing machines, water jet
looms): Applied in miniature transmission systems of fishing reels and
textile machinery.
Laboratory Instruments, Medical Devices (e.g., centrifuges,
micropumps): Used in high-precision rotating components of laboratory
instruments and medical devices.
5. Emerging Technology Fields
Gimbals, Drone Motors: Ideal for lightweight design requirements in applications like
gimbal stabilizers and drone motors.
Robot Joints, Miniature Actuators in Automated Production Lines: Employed in robot joints and miniature actuators in automation.
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 |
