8mm Bore High Speed Deep Groove Ball Bearings 678 617/8 ZZ Minature 8 X12X3.5mm
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 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 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. Aerospace Engine Auxiliary Systems
In auxiliary systems such as fuel pumps and cooling fans, which require small rotating components, the compact size and high-speed performance of the 678 ZZ bearing are crucial.
2. Spacecraft Precision Mechanisms
For mechanisms like camera gimbals and solar panel steering systems, this bearing provides the necessary micro-scale support for high-sensitivity operations.
3. Drone Motors
The 678 ZZ bearing supports lightweight, low-noise operation in small drones, contributing to their efficient and quiet performance.
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