W 639/2-2Z
W Series Stainless Steel Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
W 639/2-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.000308 kg
Tolerance class
P0
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
2 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
6 mm
Outside diameter tolerance
-0.008mm to 0
Width
3 mm
Width tolerance
-0.04mm to 0
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
43 lbf
Radial static load rating
11 lbf
Limiting speed
90 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:
$ 1.71
/ each
In Stock
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W 639/2-2Z Bearing Product Overview & Core Advantages
The W 639/2-2Z is a miniature single row deep groove ball bearing engineered for precision applications requiring compact design and reliable performance. Constructed entirely from stainless steel, it offers excellent corrosion resistance. Its key advantages include the ability to handle radial loads efficiently and its suitability for high-speed operation up to 90,000 rpm. The integrated shielded design (2Z) helps retain lubrication and exclude contaminants, making it a robust and long-lasting solution for demanding miniature assemblies.
W 639/2-2Z Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Benefit |
|---|---|---|
| W 639/2 | Basic bearing designation, indicating a specific series of miniature deep groove ball bearings. | Defines the core bearing dimensions and internal geometry. |
| -2Z | Bearing is equipped with shields on both sides. | Protects against contamination and retains lubricant, enhancing service life with minimal maintenance. |
W 639/2-2Z Bearing Structural Features & Performance Benefits
- Compact and Lightweight Design: With a bore diameter of 2 mm and a weight of only 0.000308 kg, this bearing is ideal for space-constrained and weight-sensitive applications.
- Corrosion Resistance: Manufactured from stainless steel for the rings, balls, and cage, it provides superior performance in harsh or wash-down environments.
- High-Speed Capability: The optimized deep groove raceway and shielded construction contribute to a high limiting speed of 90,000 rpm.
- Precision and Reliability: Built to P0 tolerance class and standard CN radial internal clearance, ensuring consistent performance and smooth operation.
- Pre-lubricated for Longevity: Factory-filled grease and shielded design provide a maintenance-free solution over a wide temperature range from -30°C to 120°C.
W 639/2-2Z Bearing Typical Application Areas
This bearing is commonly specified in:
- Precision Instruments and miniature mechanical devices
- Small DC Motors and stepper motors
- Medical Devices and dental handpieces
- Office automation equipment (e.g., printers, scanners)
- Robotics and miniature gearboxes
