W 638/2 X-2Z
W Series Stainless Steel Miniature Bearings
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Part No.
Part No.
W 638/2 X-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
2.5 mm
Width tolerance
-0.04mm to 0
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
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In Stock
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W 638/2 X-2Z Bearing Product Overview & Core Advantages
The W 638/2 X-2Z is a miniature single row deep groove ball bearing designed for applications demanding compact size 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 being shielded (2Z) and pre-lubricated for maintenance-free operation, making it ideal for high-speed, precision mechanisms where space is limited and long-term reliability is critical.
W 638/2 X-2Z Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Code | Technical Meaning |
|---|---|---|
| Bearing Series | W 638/2 | Indicates a miniature deep groove ball bearing series with a 2 mm bore diameter. |
| Internal Design | X | Specific internal design variant from the manufacturer. |
| Seal Type | 2Z | Signifies double-shielded construction on both sides, providing effective protection against contamination while allowing for high-speed operation. |
W 638/2 X-2Z Bearing Structural Features & Performance Benefits
- Compact & Robust Design: The single-row, deep groove raceway and all-stainless steel construction (rings, balls, cage) provide a compact yet durable solution with high corrosion resistance.
- Radial Load Capacity: Engineered to efficiently support radial loads in compact assemblies, with a dynamic load rating of 21 lbf.
- High-Speed Performance: The double-shielded (2Z) design, combined with a stainless steel cage and optimized grease lubrication, supports a limiting speed of 100,000 rpm, making it a true high-speed bearing.
- Maintenance-Free Operation: The non-contact shields retain the factory-fill grease, protecting against contaminants and ensuring long-term, maintenance-free performance within the specified temperature range (-30°C to 120°C).
- Precision & Consistency: Manufactured to P0 tolerance class and standard CN radial internal clearance, ensuring reliable and consistent performance in precision applications.
W 638/2 X-2Z Bearing Typical Application Areas
- Small Precision Motors (e.g., in drones, miniature fans)
- Medical and Dental Handpieces
- Office Automation Equipment (e.g., printers, scanners)
- Instrumentation and Control Devices
- High-Speed Spindles in small-scale machining
- Various miniature mechanical systems requiring reliable, high-speed rotation.
