W 638/2-2Z
W Series Stainless Steel Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
W 638/2-2Z
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
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
Price:
$ 1.7
/ each
In Stock
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W 638/2-2Z Bearing Product Overview & Core Advantages
The W 638/2-2Z is a metric miniature deep groove ball bearing engineered for precision applications requiring compact design and reliable performance. Constructed entirely from stainless steel, this single-row bearing is optimized for radial loads and offers excellent corrosion resistance. Its shielded design (2Z) and factory-applied grease lubrication provide robust contamination protection and long-term, maintenance-free operation, making it ideal for high-speed, high-reliability miniature systems.
W 638/2-2Z Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| W 638/2 | Basic bearing designation indicating a specific miniature deep groove ball bearing series with a 2 mm bore. |
| 2Z | Signifies shielded on both sides. This provides effective protection against contaminants while allowing for high-speed operation. |
W 638/2-2Z Bearing Structural Features & Performance Benefits
- Compact & Lightweight Design: With dimensions of 2mm (bore) x 5mm (OD) x 2.3mm (width) and a weight of just 0.000204 kg, it is perfect for space-constrained and weight-sensitive applications.
- High-Speed Capability: The combination of a stainless steel cage, precision-ground components, and optimized lubrication enables a limiting speed of 100,000 rpm.
- Corrosion Resistance & Longevity: Manufactured entirely from stainless steel (rings, balls, cage), this bearing is highly resistant to rust and corrosion, ensuring consistent performance in harsh environments.
- Maintenance-Free Operation: The pre-lubricated and double-shielded (2Z) construction seals in grease and seals out debris, offering a long service life without the need for re-lubrication.
W 638/2-2Z Bearing Typical Application Areas
This miniature bearing is widely used in:
- Precision Instruments: Optical encoders, measuring devices, and laboratory equipment.
- Small Motors & Drives: High-speed spindle motors for dental handpieces, miniature DC motors, and drones.
- Office Automation: Printers, scanners, and copiers.
- Medical Devices: Small surgical tools and diagnostic equipment.
- Electronics: Cooling fans and small gearboxes.
