Deep Groove Ball Bearings & Motor Bearings Manufacturer | NKMB
The 6700, 6800 and 6900 series are among the most widely used thin section deep groove ball bearings in industrial applications. Although they share similar designs, each series offers different dimensions, load capacities and performance characteristics.
Understanding the differences between these bearing series helps engineers and purchasing managers select the most suitable bearing for robotics, electric motors, automation systems and precision equipment.
Overview of Thin Section Bearings
Thin section bearings are designed to reduce space requirements while maintaining reliable performance. Compared with standard deep groove ball bearings, thin section bearings have smaller cross-sections and lighter weight.
Common advantages include:
- Compact structure
- Reduced weight
- Low friction
- High speed capability
- Space-saving installation
6700 Series Bearings
The 6700 series is the thinnest bearing series among the three.
Advantages
- Ultra-thin profile
- Extremely lightweight
- Ideal for compact assemblies
- Suitable for high-speed operation
Typical Applications
- Miniature motors
- Drones
- Medical devices
- Portable equipment
- Precision instruments
Example
6704ZZ: 20×27×4 mm
6800 Series Bearings
The 6800 series provides a balance between compact dimensions and load carrying capability.
Advantages
- Better load capacity than 6700 series
- Good speed performance
- Compact design
- Cost-effective solution
Typical Applications
- Servo motors
- Automation systems
- Industrial robots
- Gearboxes
- Electric tools
Example
6804ZZ: 20×32×7 mm
6900 Series Bearings
The 6900 series offers the highest load capacity among the three thin section bearing series.
Advantages
- Higher radial load capacity
- Better structural rigidity
- Longer service life under heavy loads
- Excellent stability
Typical Applications
- Industrial machinery
- Heavy-duty motors
- Automation equipment
- Agricultural machinery
Example
6904ZZ: 20×37×9 mm
Comparison Table
| Series | Example Size | Thickness | Load Capacity | Speed |
|---|---|---|---|---|
| 6700 | 20×27×4 | Ultra Thin | Low | Very High |
| 6800 | 20×32×7 | Thin | Medium | High |
| 6900 | 20×37×9 | Standard Thin | High | Medium |
Which Bearing Series Should You Choose?
Choose 6700 series if:
- Space is extremely limited
- Weight reduction is critical
Choose 6800 series if:
- Balanced performance is required
- Moderate load capacity is sufficient
Choose 6900 series if:
- Higher loads are expected
- Equipment durability is important
Why Choose NKMB Bearings?
NKMB specializes in thin section bearings, miniature bearings and deep groove ball bearings. With advanced manufacturing technology and strict quality control, NKMB provides reliable bearing solutions for global customers in robotics, automation, motors and industrial applications.
Conclusion
The 6700, 6800 and 6900 bearing series each offer unique advantages. Selecting the right bearing depends on installation space, load requirements and operating conditions. For expert support and OEM bearing solutions, contact NKMB today.
