684zz
600 Series Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
684zz
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
1 g
Tolerance class
ABEC1
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
4 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
9 mm
Outside diameter tolerance
-0.008mm to 0
Width
4 mm
Width tolerance
-0.12mm to 0
Inner Ring Dimensions
Inner ring type
Standard
Ball & Washer Dimensions
Ball diameter
1.588 mm
Ball quantity
7
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
123 lbf
Radial static load rating
41 lbf
Limiting speed
53 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
Shield material
300 Series Stainless Steel
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 1.13
/ each
In Stock
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684zz Bearing Product Overview & Core Advantages
The 684ZZ is a miniature deep groove ball bearing designed for precision applications requiring compact dimensions and reliable performance. As a single row, shielded bearing with a metric design, it excels in handling radial loads efficiently. Its compact size (4mm bore, 9mm OD, 4mm width) makes it ideal for space-constrained assemblies, while the stainless steel cage and shields contribute to smooth operation and durability. Engineered to ABEC1 precision tolerances, this bearing offers a cost-effective solution for high-speed applications, with a limiting speed of 53,000 rpm.
684zz Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 684 | Bearing series and size code | Denotes a miniature bearing with 4mm bore, 9mm OD, and 4mm width. |
| ZZ | Double metal shields (one on each side) | Provides effective contaminant protection, retaining lubricant and extending service life in dusty environments. |
684zz Bearing Structural Features & Performance Benefits
- Deep Groove Raceway & High-Quality Components: The optimized raceway geometry and chrome steel rings and balls ensure low noise, low vibration, and high running accuracy, suitable for precision applications.
- Robust Load Capacity: With a dynamic load rating of 123 lbf and a static load rating of 41 lbf, this bearing reliably handles significant radial loads for its size.
- High-Speed Capability: The combination of a lightweight stainless steel cage, precision grinding, and optimized internal geometry enables a high limiting speed of 53,000 rpm.
- Controlled Internal Clearance: The MC3 radial internal clearance (0.002mm to 0.013mm) is suited for applications requiring precise running fits and minimal play.
- Shielded & Lubricated Design: The ZZ shields protect against contamination while retaining the necessary lubrication, reducing maintenance needs.
684zz Bearing Typical Application Areas
- Small Precision Motors: Ideal for spindle support in small DC motors, stepper motors, and brushless motors.
- Office Automation Equipment: Widely used in printers, scanners, copiers, and hard disk drives.
- Instrumentation and Medical Devices: Suitable for precision instruments, optical encoders, and small medical tools.
- Consumer Electronics: Found in cooling fans, drones, RC models, and various small appliances.
- General Industrial Machinery: Applicable in small gearboxes, pulleys, and other light-duty mechanical drives.
