W 638/2.5 R-2Z
W Series Stainless Steel Flanged Miniature Bearings
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Part No.
Part No.
W 638/2.5 R-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.000405 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
Outer Ring Dimensions
Flange outer diameter
7.1 mm
Flange thickness
0.8 mm
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
In Stock
Price available upon request.
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W 638/2.5 R-2Z Bearing Product Overview & Core Advantages
The W 638/2.5 R-2Z is a metric miniature deep groove ball bearing designed for applications demanding compact size and reliable performance. Featuring single row construction and stainless steel components throughout, this bearing offers excellent corrosion resistance. Its shielded design (2Z) provides effective contamination protection while the pre-lubricated grease ensures immediate operation and long service life. Engineered for primarily radial loads, it is ideal for high-speed, precision mechanisms where space is constrained and reliability is paramount.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| W 638 | Bearing series designation for miniature deep groove ball bearings |
| 2.5 | Bore diameter: 2.5 mm |
| R | Flanged outer ring design |
| 2Z | Non-contact shields on both sides for contamination protection |
W 638/2.5 R-2Z Bearing Structural Features & Performance Benefits
- Compact Design & High Precision: With dimensions of just 2.5mm bore × 6mm OD × 2.6mm width, this bearing offers an exceptional power density. Manufactured to P0 tolerance class with tight dimensional tolerances, it ensures precise rotational accuracy in miniature applications.
- Corrosion Resistance: Constructed entirely from stainless steel (rings, balls, and cage), this bearing provides excellent resistance to corrosion, making it suitable for harsh environments and applications requiring frequent washdown.
- High-Speed Capability: The optimized design and grease lubrication enable a limiting speed of 85,000 rpm, making it suitable for high-speed miniature motors and spindles.
- Simplified Mounting: The integrated flange (7.1mm diameter) facilitates easy and secure axial location within housings, simplifying assembly and reducing overall component count.
- Maintenance-Free Operation: The combination of non-contact shields (2Z) and factory-applied grease creates a sealed, lubricated environment, providing long-term, maintenance-free operation.
W 638/2.5 R-2Z Bearing Typical Application Areas
- Precision Instruments: Optical encoders, measuring devices, and laboratory equipment
- Small Motors & Drives: Miniature DC motors, stepper motors, and drone propulsion systems
- Medical Devices: Surgical hand tools, dental drills, and pump mechanisms
- Office Automation: Printers, scanners, and small cooling fans
- Robotics: Joints and actuators in small-scale robotic systems
