W 639
W Series Stainless Steel Miniature Bearings
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Part No.
Part No.
W 639
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.033 kg
Tolerance class
P0
Seal type
Open
For load direction
Radial
Main Dimensions
Bore diameter
9 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
30 mm
Outside diameter tolerance
-0.009mm to 0
Width
10 mm
Width tolerance
-0.12mm to 0
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
980 lbf
Radial static load rating
522 lbf
Limiting speed
36 X 1000 rpm
Lubrication
None
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
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In Stock
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W 639 Bearing Product Overview & Core Advantages
The W 639 is a metric single row deep groove ball bearing engineered for high performance in radial load applications. Constructed entirely from stainless steel, it offers excellent corrosion resistance and is suitable for a wide operating temperature range. This bearing is characterized by its open design and P0 tolerance class, providing reliable and precise operation. Its compact dimensions and high limiting speed make it an ideal choice for applications demanding durability and efficiency in challenging environments.
W 639 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| W | Stainless Steel Bearing Series |
| 639 | Bore Diameter: 9 mm, Standard Metric Dimension Series |
| Open (No Seal) | Allows for high-speed operation and custom lubrication, but requires a clean operating environment. |
| P0 Tolerance | Standard tolerance class for normal precision applications. |
| CN Clearance | Normal radial internal clearance, suitable for most common operating conditions. |
W 639 Bearing Structural Features & Performance Benefits
- All-Stainless Steel Construction: The rings, balls, and cage are manufactured from stainless steel, providing superior corrosion resistance and making the bearing suitable for wet or chemically aggressive environments, as well as food and medical applications.
- Deep Groove Raceway: The geometry of the deep groove raceway is optimized to support high radial dynamic load ratings and accommodate moderate axial loads in both directions.
- Open Design for High-Speed Performance: The absence of seals or shields minimizes friction and heat generation, enabling the bearing to achieve its maximum limiting speed of 36,000 rpm. This makes it an excellent choice for high-speed applications.
- Precision & Reliability: Manufactured to P0 tolerance standards, this bearing ensures consistent running accuracy and smooth operation, contributing to the overall reliability of the assembly.
W 639 Bearing Typical Application Areas
This versatile ball bearing is commonly specified in:
- Electric Motors and Small Gearboxes
- Medical and Dental Handpieces
- Food Processing and Packaging Machinery
- Precision Instruments and Optical Devices
- Agricultural Sprayers and Marine Equipment
- Various machinery requiring corrosion-resistant components.
