681
600 Series Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
681
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.03 g
Tolerance class
ABEC1
Seal type
Open
For load direction
Radial
Main Dimensions
Bore diameter
1 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
3 mm
Outside diameter tolerance
-0.008mm to 0
Width
1 mm
Width tolerance
-0.12mm to 0
Inner Ring Dimensions
Inner ring type
Standard
Ball & Washer Dimensions
Ball diameter
0.6 mm
Ball quantity
6
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
18 lbf
Radial static load rating
5 lbf
Limiting speed
130 X 1000 rpm
Lubrication
Required
Radial internal clearance
MC3
Radial internal clearance
0.002mm to 0.013mm
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Stainless Steel
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 14.7
/ each
In Stock
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681 Bearing Product Overview & Core Advantages
The 681 bearing is a metric miniature deep groove ball bearing engineered for applications demanding compact size and reliable performance. As a single row, open design, it is optimized for handling primarily radial loads. Its precision construction using high-grade chrome steel rings and balls, combined with a stainless steel cage, ensures smooth operation and long service life. This bearing is an ideal solution for high-speed, compact mechanisms where space is at a premium and consistent performance is critical.
681 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 681 | Standard designation for a miniature deep groove ball bearing with a 1mm bore, 3mm OD, and 1mm width. |
| Open | No shield or seal, allowing for higher limiting speeds and easy re-lubrication. Requires a clean operating environment or external sealing. |
| ABEC1 | Defines the precision class, indicating standard tolerances for runout and dimensions suitable for a wide range of general applications. |
| MC3 | Specifies the radial internal clearance group. MC3 is a "Normal" clearance range (0.002mm to 0.013mm), suitable for most common operating conditions. |
681 Bearing Structural Features & Performance Benefits
- Compact Design & Lightweight: With an ultra-compact bearing size of 1x3x1mm and a weight of only 0.03g, this bearing is engineered for miniature assemblies and portable devices where every milligram and millimeter counts.
- High-Speed Capability: The combination of an open design, a precision stainless steel cage, and six finely polished balls enables a high limiting speed of 130,000 rpm, making it suitable for demanding high-rotation applications.
- Robust Load Capacity: Despite its miniature size, it offers a dynamic load rating of 18 lbf and a static load rating of 5 lbf, providing reliable support for radial loads in compact systems.
- Precision Engineering: Manufactured to ABEC1 tolerance standards with controlled radial internal clearance (MC3), ensuring consistent performance, low vibration, and smooth running.
- Material Integrity: Constructed from chrome steel for rings and balls, offering excellent hardness and wear resistance, paired with a durable stainless steel cage for mechanical stability and corrosion resistance.
681 Bearing Typical Application Areas
This miniature ball bearing is critical in a wide array of precision industries and devices, including:
- Small Precision Motors: Used in stepper motors, coreless motors, and miniature DC motors.
- Medical and Dental Devices: Ideal for surgical handpieces, dental drills, and miniature pumps.
- Office Automation Equipment: Found in printers, scanners, and small fans.
- Instrumentation and Gauges: Supports rotating components in precision measuring devices.
- Robotics and RC Models: Used in joints, gears, and small drive systems.
