W 639/3-2Z
W Series Stainless Steel Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
W 639/3-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.000822 kg
Tolerance class
P0
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
3 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
8 mm
Outside diameter tolerance
-0.008mm to 0
Width
4 mm
Width tolerance
-0.12mm to 0
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
72 lbf
Radial static load rating
20 lbf
Limiting speed
75 X 1000 rpm
Lubrication
Grease
Radial internal clearance
CN
Materials
Ring material
Stainless Steel
Ball material
Stainless Steel
Cage material
Stainless Steel
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 1.72
/ each
In Stock
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W 639/3-2Z Bearing Product Overview & Core Advantages
The W 639/3-2Z is a metric miniature deep groove ball bearing designed for precision applications requiring compact dimensions and reliable performance. This single row bearing excels at handling radial loads and is constructed entirely from stainless steel for enhanced corrosion resistance. Its shielded design (2Z) and factory-applied grease lubrication provide a robust, maintenance-free solution, making it ideal for high-speed, long-life operations in demanding environments. The combination of a small 3 mm bore, lightweight construction, and a P0 tolerance class ensures consistent performance in precision assemblies.
W 639/3-2Z Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| W 639/3 | Basic bearing series with 3 mm bore diameter | Identifies the bearing family and size. |
| -2Z | Bearing with shields on both sides | Provides effective contamination protection while allowing for high-speed operation compared to contact seals. |
W 639/3-2Z Bearing Structural Features & Performance Benefits
- Compact & Lightweight Design: With dimensions of 3x8x4 mm and a weight of only 0.000822 kg, this bearing is engineered for space-constrained and weight-sensitive applications.
- Corrosion Resistance: Manufactured from stainless steel for the rings, balls, and cage, it offers excellent performance in humid or corrosive environments.
- High-Speed Capability: The shielded (2Z) construction and optimized grease lubrication enable a limiting speed of 75,000 rpm, making it suitable for high-rotation applications.
- Maintenance-Free Operation: The combination of non-contact shields and pre-applied grease ensures long-term, reliable performance without the need for re-lubrication.
- Standardized Performance: Built to P0 tolerance class and standard CN radial internal clearance, ensuring predictable performance and ease of integration.
W 639/3-2Z Bearing Typical Application Areas
This bearing is ideally suited for:
- Precision Small Motors: Such as stepper motors and DC micromotors.
- Medical Devices & Instrumentation: Including dental handpieces, small pumps, and optical equipment.
- Office Automation Equipment: Printers, scanners, and copiers.
- Robotics & Automation: Small joints, gearboxes, and encoder systems.
- Consumer Electronics: Drones, small fans, and precision tools.
