688
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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688 Bearing Product Overview & Core Advantages
The 688 metric ball bearing is a precision-engineered single row deep groove ball bearing designed for reliable performance in compact spaces. This open-type bearing excels in applications requiring high-speed operation and efficient radial load capacity. Manufactured to ABEC1 tolerance standards, it ensures consistent performance and smooth operation, making it an ideal component for various industrial and precision mechanisms where space and weight are critical constraints.
688 Bearing Model Code Explained, Specifications & Naming Convention
| Code Element | Technical Meaning |
|---|---|
| 688 | Standard metric series designation indicating bearing dimensions: 8mm bore, 16mm OD, 4mm width |
| Open | No seals or shields, allowing for maximum speed capability and easy relubrication |
| ABEC1 | Precision tolerance class ensuring dimensional accuracy and smooth running |
| MC3 | Standard radial internal clearance group (0.002-0.013mm) for general applications |
688 Bearing Structural Features & Performance Benefits
This bearing features a single row deep groove raceway design that provides optimal radial load distribution. The stainless steel cage ensures precise ball guidance and contributes to the bearing's high limiting speed of 36,000 rpm. With chrome steel rings and balls, the bearing delivers excellent durability and wear resistance. The MC3 radial clearance provides optimal operational performance across a wide temperature range (-30° to 110°C), while the compact bearing dimensions (8×16×4mm) make it suitable for space-constrained applications.
688 Bearing Typical Application Areas
- Small electric motors and miniature DC motors
- Precision instruments and laboratory equipment
- Office automation devices including printers and scanners
- Medical devices and dental handpieces
- Robotics and miniature mechanical assemblies
- Computer cooling fans and small power tools
