W 639-2Z
W Series Stainless Steel Miniature Bearings
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Part No.
Part No.
W 639-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.035 kg
Tolerance class
P0
Seal type
Shielded
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
30 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
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W 639-2Z Bearing Product Overview & Core Advantages
The W 639-2Z is a single row deep groove ball bearing designed for high-performance applications requiring reliable operation. This metric bearing features a shielded design on both sides, offering effective protection against contamination while retaining lubrication. Manufactured entirely from stainless steel, it provides excellent corrosion resistance, making it suitable for demanding environments. Its compact design and P0 tolerance class ensure consistent performance and ease of integration into precision assemblies, offering a robust solution for radial loads.
W 639-2Z Bearing Model Code Explained, Specifications & Naming Convention
The model number W 639-2Z can be broken down as follows:
- W 639: Denotes the basic bearing series, a single row deep groove ball bearing with a 9 mm bore.
- 2Z: Indicates the bearing is shielded on both sides. This provides protection from solid contaminants while allowing for higher rotational speeds compared to contact seals.
W 639-2Z Bearing Structural Features & Performance Benefits
- Robust Construction: The single row deep groove raceway and stainless steel construction (rings, balls, and cage) deliver high corrosion resistance and durability.
- Radial Load Capacity: Engineered to handle significant radial dynamic load ratings (980 lbf), ensuring reliable performance under primary radial forces.
- Optimized for Speed: The non-contact 2Z shields and grease lubrication contribute to a high limiting speed of 30,000 rpm, suitable for fast-rotating applications.
- Maintenance-Free Operation: The combination of pre-lubricated grease and shielded design provides long-term, maintenance-free service within the specified temperature range of -30°C to 120°C.
- Precision Fit: Manufactured to standard P0 tolerance and normal radial internal clearance (CN), ensuring predictable performance and ease of installation.
W 639-2Z Bearing Typical Application Areas
This bearing is ideal for a wide range of applications, including:
- Electric Motors and small precision gearboxes.
- Medical Equipment and dental handpieces requiring corrosion resistance.
- Food Processing Machinery and other applications where stainless steel is mandated.
- Office Automation Equipment such as printers and scanners.
- Various instrumentation and precision mechanical drives.
