W 638/2 R-2Z
W Series Stainless Steel Flanged Miniature Bearings
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Part No.
Part No.
W 638/2 R-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.000204 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
5 mm
Outside diameter tolerance
-0.008mm to 0
Width
2.3 mm
Width tolerance
-0.04mm to 0
Outer Ring Dimensions
Flange outer diameter
6.1 mm
Flange thickness
0.6 mm
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
21 lbf
Radial static load rating
6 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 638/2 R-2Z Bearing Product Overview & Core Advantages
The W 638/2 R-2Z is a miniature single row deep groove ball bearing engineered for precision applications requiring compact design and reliable performance. Constructed entirely from stainless steel, it offers excellent corrosion resistance. Its key advantages include the ability to handle radial loads efficiently, a shielded design (2Z) for contaminant protection, and pre-lubrication for maintenance-free operation. This bearing is ideal for applications demanding high rotational speeds, precise dimensional tolerances, and long-term reliability in challenging environments.
W 638/2 R-2Z Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| W 638/2 | Indicates the bearing series and size designation for a miniature deep groove ball bearing. |
| R | Specifies a flanged outer ring, which aids in precise axial location and simplifies housing design. |
| 2Z | Denotes non-contact shields on both sides. This provides effective protection against contamination while minimizing friction and allowing for high limiting speeds. |
W 638/2 R-2Z Bearing Structural Features & Performance Benefits
- Compact & Robust Flange Design: The integrated flange (Flange outer diameter: 6.1 mm) ensures easy and secure mounting, preventing axial movement and simplifying assembly in compact spaces.
- High-Speed Capability: The combination of a stainless steel cage, low-friction shields, and optimized grease lubrication enables a high limiting speed of 100,000 rpm, making it suitable for very fast-rotating components.
- Corrosion Resistance & Longevity: Manufactured entirely from stainless steel (rings, balls, and cage), this bearing is inherently resistant to rust and corrosion, ensuring reliable performance in humid or chemically aggressive environments.
- Maintenance-Free Operation: The bearing is pre-lubricated with grease and sealed with shields (2Z), creating a self-contained unit that does not require relubrication throughout its service life, reducing maintenance costs.
- Precision Tolerance: Manufactured to P0 tolerance class and standard CN radial internal clearance, it provides consistent running accuracy and smooth operation, which is critical for precision mechanisms.
W 638/2 R-2Z Bearing Typical Application Areas
- Small Precision Motors: Ideal for spindle support in miniature DC motors, stepper motors, and coreless motors.
- Medical and Dental Devices: Used in surgical handpieces, dental drills, and laboratory equipment where small size, high speed, and corrosion resistance are paramount.
- Office Automation Equipment: Critical components in scanners, printers, and copiers for guiding rollers and precision shafts.
- Instrumentation and Control Systems: Supports shafts and rotors in encoders, gyroscopes, and other sensitive measuring devices.
- Radio-Controlled Models and Drones: Provides high-speed support for motor shafts in hobbyist and professional-grade models.
