W 638/2.5-2Z
W Series Stainless Steel Miniature Bearings
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Part No.
Part No.
W 638/2.5-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.000305 kg
Tolerance class
P0
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
2.5 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
6 mm
Outside diameter tolerance
-0.008mm to 0
Width
2.6 mm
Width tolerance
-0.04mm to 0
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
26 lbf
Radial static load rating
8 lbf
Limiting speed
85 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:
$ 1.77
/ each
In Stock
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W 638/2.5-2Z Bearing Product Overview & Core Advantages
The W 638/2.5-2Z is a metric 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 while offering a high limiting speed of 85,000 rpm. The integral shielded design and pre-applied grease ensure long-term, maintenance-free operation, making it ideal for high-precision, high-reliability miniature applications.
W 638/2.5-2Z Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Code | Technical Meaning |
|---|---|---|
| Bearing Series | W 638 | Indicates the miniature deep groove ball bearing series. |
| Bore Diameter | /2.5 | Specifies a bore diameter of 2.5 mm. |
| Seal Type | -2Z | Denotes bearings with shields on both sides. This provides protection against contamination while allowing for higher speed operation compared to contact seals. |
W 638/2.5-2Z Bearing Structural Features & Performance Benefits
- Compact & Robust Design: The single row deep groove geometry and compact bearing dimensions (2.5mm bore, 6mm OD, 2.6mm width) enable integration into highly space-constrained assemblies.
- Corrosion Resistance: All components, including rings, balls, and cage, are made from stainless steel, ensuring reliable performance in humid or corrosive environments.
- High-Speed Capability: The combination of a low-friction stainless steel cage, optimized internal geometry, and shields (2Z) contributes to the high limiting speed of 85,000 rpm.
- Maintenance-Free Operation: The shielded design retains the factory-applied grease lubrication, protecting against contaminant ingress and providing long service life without re-lubrication.
- Standard Tolerance & Clearance: Manufactured to P0 tolerance class and standard CN radial internal clearance, ensuring consistent and predictable performance for a wide range of general applications.
W 638/2.5-2Z Bearing Typical Application Areas
- Small Precision Motors and Stepper Motors
- Medical and Dental Hand Tools
- Optical Encoders and Precision Instruments
- Small Fans and Blowers
- Office Automation Equipment (e.g., printers, scanners)
- Radio Control Models and Drones
- Various Miniature Mechanical Drives
