W 638/1.5-2Z
W Series Stainless Steel Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
W 638/1.5-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.000102 kg
Tolerance class
P0
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
1.5 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
14 lbf
Radial static load rating
4 lbf
Limiting speed
110 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
Price:
$ 1.87
/ each
In Stock
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W 638/1.5-2Z Bearing Product Overview & Core Advantages
The W 638/1.5-2Z is a miniature deep groove ball bearing designed for applications demanding compact size, reliable performance, and maintenance-free operation. Constructed entirely from stainless steel, it offers excellent corrosion resistance. Its key advantage lies in its ability to handle primarily radial loads efficiently within a very small envelope, making it ideal for high-precision, space-constrained mechanisms. The inclusion of shielded seals ensures contaminant protection and retains lubrication, contributing to long service life and high reliability.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| W 638 | Series designation for miniature deep groove ball bearings. |
| 1.5 | Nominal bore diameter in millimeters (1.5 mm). |
| -2Z | Denotes the bearing is equipped with shielded seals on both sides. This provides effective protection against contaminants while allowing for high-speed operation. |
W 638/1.5-2Z Bearing Structural Features & Performance Benefits
- Compact & Lightweight Design: With an ultra-small cross-section (4mm OD, 2mm width) and a minimal weight of 0.000102 kg, this bearing is engineered for miniature applications where space and mass are critical constraints.
- Corrosion Resistance: The use of stainless steel for all key components (rings, balls, cage) ensures reliable performance in humid or mildly corrosive environments, enhancing the bearing's longevity.
- Maintenance-Free Operation: The 2Z shields seal in the factory-applied grease lubrication, preventing lubricant loss and ingress of dust and moisture. This makes the bearing suitable for applications where re-lubrication is impossible or undesirable.
- High-Speed Capability: The combination of a precision-ground stainless steel cage, smooth ball guiding, and optimized grease lubrication enables a high limiting speed of 110,000 rpm, making it a capable high-speed bearing for its size class.
- Standard Precision & Clearance: Manufactured to P0 tolerance class with a standard CN radial internal clearance, this bearing offers consistent and reliable performance for a wide range of general-purpose applications.
W 638/1.5-2Z Bearing Typical Application Areas
This miniature bearing is ideally suited for:
- Small Precision Motors (e.g., in drones, small fans, medical devices)
- Instrumentation and Gauges
- Office Automation Equipment (e.g., printers, scanners)
- Robotics and Miniature Actuators
- Optical and Laser Positioning Systems
