W 637/5 X-2Z
W Series Stainless Steel Miniature Bearings
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Part No.
Part No.
W 637/5 X-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.000615 kg
Tolerance class
P0
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
5 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
9 mm
Outside diameter tolerance
-0.008mm to 0
Width
3 mm
Width tolerance
-0.12mm to 0
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
56 lbf
Radial static load rating
19 lbf
Limiting speed
67 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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In Stock
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W 637/5 X-2Z Bearing Product Overview & Core Advantages
The W 637/5 X-2Z is a metric single row deep groove ball bearing designed for precision applications requiring compact dimensions and reliable performance. Constructed entirely from stainless steel, it offers excellent corrosion resistance. Its key advantage lies in its ability to handle radial loads efficiently while its shielded design (2Z) retains factory-applied grease and protects against contaminant ingress, ensuring long-term, maintenance-free operation in demanding environments. This makes it an ideal precision bearing for applications with limited space.
W 637/5 X-2Z Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| W 637/5 | Basic bearing designation, indicating a deep groove ball bearing series with a 5 mm bore. |
| X | A manufacturer-specific internal designation. |
| 2Z | Signifies the bearing is fitted with non-contact shields on both sides. This provides effective protection against dust and other particles while minimizing friction, contributing to the high limiting speed. |
W 637/5 X-2Z Bearing Structural Features & Performance Benefits
- Compact & Robust Design: With a bearing size of just 5x9x3 mm, this bearing is engineered for applications where space is at a premium. The single-row deep groove raceway and stainless steel cage provide stable operation.
- High-Speed Capability: The non-contact shields and optimized grease lubrication allow for a high limiting speed of 67,000 rpm, making it suitable for high-speed miniature applications.
- Corrosion Resistance & Longevity: All components, including rings, balls, and cage, are made from stainless steel. This, combined with the sealed-for-life design, ensures reliable performance in humid or corrosive environments and contributes to a long service life.
- Precision & Low Noise: Manufactured to P0 tolerance class and standard CN radial internal clearance, this bearing ensures smooth and quiet running, which is critical for sensitive instrumentation.
W 637/5 X-2Z Bearing Typical Application Areas
- Small Precision Electric Motors (e.g., drones, miniature fans)
- Medical and Dental Handpieces
- Office Automation Equipment (printers, scanners)
- Precision Instruments and Optical Devices
- Radio-Control Models and Small Robotics
