W 637/9 R-2Z
W Series Stainless Steel Flanged Miniature Bearings
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Part No.
Part No.
W 637/9 R-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.0019 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
14 mm
Outside diameter tolerance
-0.008mm to 0
Width
4.5 mm
Width tolerance
-0.12mm to 0
Outer Ring Dimensions
Flange outer diameter
15.5 mm
Flange thickness
0.8 mm
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
117 lbf
Radial static load rating
53 lbf
Limiting speed
45 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 637/9 R-2Z Bearing Product Overview & Core Advantages
The W 637/9 R-2Z is a single row deep groove ball bearing designed for exceptional performance in compact spaces. Engineered with stainless steel components, it offers excellent corrosion resistance. Its key advantages include the ability to handle significant radial loads, reliable operation provided by shielded construction, and pre-lubrication for immediate use. This bearing is characterized by its high precision (P0 tolerance class) and is ideal for applications demanding reliability and long service life in challenging environments.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| W 637/9 | Bearing series and size designation (9mm bore). |
| R | Flanged outer ring design for simplified axial location. |
| 2Z | Bearing is shielded on both sides to retain lubricant and exclude contaminants. |
W 637/9 R-2Z Bearing Structural Features & Performance Benefits
- Robust Construction: Manufactured entirely from stainless steel (rings, balls, cage), providing superior corrosion resistance and durability.
- Flanged Design: The integrated flange (15.5 mm outer diameter) allows for easy and secure mounting, simplifying housing design and reducing assembly costs.
- Shielded & Pre-Lubricated: The 2Z non-contact shields effectively protect the bearing interior from contaminants while retaining the factory-applied grease, enabling maintenance-free operation for the life of the bearing in many applications.
- High-Speed Capability: Optimized for a limiting speed of 45,000 rpm, making it suitable for high-speed miniature and instrument applications.
- Precision Performance: Built to P0 tolerance class and standard CN radial internal clearance, ensuring consistent and reliable running accuracy.
W 637/9 R-2Z Bearing Typical Application Areas
This bearing is ideally suited for applications requiring a compact, corrosion-resistant, and maintenance-free solution. Common industries and equipment include:
- Precision Instruments and measuring devices
- Small Electric Motors (e.g., in drones, small fans)
- Medical Devices and dental handpieces
- Office Automation Equipment (printers, scanners)
- Food and Beverage Machinery (due to stainless steel construction)
