689
600 Series Miniature Bearings
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Basic Information
Main Dimensions
Inner Ring Dimensions
Ball & Washer Dimensions
Performance
Materials
Environment & Compliance
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689 Bearing Product Overview & Core Advantages
The 689 metric ball bearing is a single row deep groove ball bearing designed for high-performance radial load applications. Engineered with precision ABEC1 tolerances, this compact bearing (9mm bore, 17mm OD, 4mm width) offers reliable operation and excellent rotational characteristics. Its open design allows for versatile lubrication options, making it suitable for applications requiring custom lubrication solutions. The combination of chrome steel rings, stainless steel cage, and high-grade balls ensures durability and consistent performance across a temperature range of -30°C to 110°C.
689 Bearing Model Code Explained, Specifications & Naming Convention
| Code Element | Technical Meaning |
|---|---|
| 689 | Standard metric series designation for ultra-small bore bearings |
| Open | No seals or shields, allowing maximum speed capability and custom lubrication |
| MC3 | Radial internal clearance group (0.002mm to 0.013mm) |
689 Bearing Structural Features & Performance Benefits
Deep Groove Geometry: The optimized raceway design enables efficient radial load distribution and accommodates moderate axial loads in both directions.
High-Speed Capability: With a limiting speed of 36,000 rpm and stainless steel cage construction, this bearing maintains stability and reduces friction at high rotational velocities.
Precision Engineering: Manufactured to ABEC1 tolerance class with tight dimensional controls (bore/OD tolerance: -0.008mm to 0), ensuring consistent performance and easy installation.
Material Excellence: Chrome steel rings and balls provide high wear resistance, while the stainless steel cage offers corrosion resistance and cage integrity.
Optimized Internal Clearance: The MC3 clearance group (0.002mm to 0.013mm) provides optimal running fit for most applications, balancing thermal expansion and operational precision.
689 Bearing Typical Application Areas
- Small precision motors and miniature DC motors
- Medical devices and dental handpieces
- Office automation equipment including printers and scanners
- Instrumentation and measuring devices
- Robotics and small automation components
- RC models and hobbyist applications
- Textile machinery spindles and guides
