W 637/2-2Z
W Series Stainless Steel Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
W 637/2-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.000103 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
4 mm
Outside diameter tolerance
-0.008mm to 0
Width
2 mm
Width tolerance
-0.04mm to 0
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
15 lbf
Radial static load rating
4 lbf
Limiting speed
100 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
In Stock
Price available upon request.
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W 637/2-2Z Bearing Product Overview & Core Advantages
The W 637/2-2Z is a metric miniature deep groove ball bearing engineered for precision applications requiring compact dimensions and reliable performance. Constructed entirely from stainless steel, it offers excellent corrosion resistance. Its single row design with shielded (2Z) seals provides effective protection against contamination while retaining factory-fresh grease lubrication. This bearing is optimized to handle primarily radial loads and is characterized by its very small bore diameter of 2 mm, making it ideal for high-precision, space-constrained mechanisms.
Model Code Breakdown
The model designation W 637/2-2Z provides key technical specifications:
- W 637/2: Indicates the bearing series and size, specifying a 2 mm bore diameter.
- 2Z: Denotes that the bearing is equipped with shielded seals on both sides. This provides robust protection against solid contaminants and helps retain lubrication.
- Lubrication: The bearing comes pre-lubricated with grease, suitable for the standard operating temperature range.
W 637/2-2Z Bearing Structural Features & Performance Benefits
- Compact and Lightweight Design: With dimensions of 2x4x2 mm (Bore x OD x Width) and a weight of just 0.000103 kg, this bearing is designed for miniature applications where space and weight are critical factors.
- Corrosion Resistance: All components, including the rings, balls, and cage, are manufactured from stainless steel, ensuring reliable operation in humid or mildly corrosive environments.
- Shielded Protection: The non-contact 2Z shields protect the internal bearing components from dust and debris without significantly increasing rotational torque, contributing to a limiting speed of 100,000 rpm.
- Precision and Reliability: Manufactured to P0 tolerance class and standard CN radial internal clearance, this bearing ensures consistent performance and smooth operation in precision instruments.
W 637/2-2Z Bearing Typical Application Areas
This miniature bearing is ideally suited for applications demanding small size, precision, and corrosion resistance, including:
- Small precision motors and gearboxes
- Medical and dental hand tools
- Optical encoders and scanners
- Instrumentation and control devices
- Small drones and RC models
