W 638/3 R-2Z
W Series Stainless Steel Flanged Miniature Bearings
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Part No.
Part No.
W 638/3 R-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.00051 kg
Tolerance class
P0
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
3 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
7 mm
Outside diameter tolerance
-0.008mm to 0
Width
3 mm
Width tolerance
-0.12mm to 0
Outer Ring Dimensions
Flange outer diameter
8.1 mm
Flange thickness
0.8 mm
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
40 lbf
Radial static load rating
13 lbf
Limiting speed
80 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 638/3 R-2Z Bearing Product Overview & Core Advantages
The W 638/3 R-2Z is a miniature deep groove ball bearing designed for applications demanding compact size, reliable performance, and long service life. Constructed entirely from stainless steel, it offers excellent corrosion resistance. Its key advantages include the ability to handle radial loads efficiently, shielded construction for contaminant protection, and pre-lubrication for maintenance-free operation. This makes it an ideal choice for high-precision, space-constrained applications requiring consistent performance.
W 638/3 R-2Z Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| W 638/3 | Basic bearing designation, indicating a metric, single row deep groove ball bearing series with a 3 mm bore. |
| R | Designates a flanged outer ring, which aids in precise axial location and simplifies housing design. |
| 2Z | Signifies non-contact shields on both sides. This provides effective protection against contaminants while minimizing friction, contributing to the high limiting speed. |
W 638/3 R-2Z Bearing Structural Features & Performance Benefits
- Compact & Lightweight Design: With dimensions of 3x7x3 mm and a weight of just 0.00051 kg, it is engineered for miniature applications where space and weight are critical constraints.
- Robust Stainless Steel Construction: All components, including rings, balls, and cage, are made from stainless steel, ensuring superior corrosion resistance and durability in harsh environments.
- Flanged Outer Ring: The integral flange (8.1 mm outer diameter) provides secure axial positioning, prevents bearing creep, and simplifies assembly, enhancing overall mounting reliability.
- Shielded & Pre-Lubricated: The 2Z shields retain grease and exclude debris. Combined with factory-applied grease lubrication, this creates a sealed, maintenance-free system ideal for the specified temperature range of -30°C to 120°C.
- Precision Performance: Manufactured to P0 tolerance class and standard CN radial internal clearance, it delivers smooth and reliable operation for a wide range of miniature precision equipment.
W 638/3 R-2Z Bearing Typical Application Areas
- Small Precision Motors: Ideal for stepper motors, DC micromotors, and fan motors.
- Medical and Dental Devices: Used in handheld surgical tools, dental handpieces, and diagnostic equipment.
- Office Automation Equipment: Suitable for printers, scanners, and small copiers.
- Instrumentation and Control Systems: Applied in encoders, sensors, and precision gauges.
- Radio Control Models and Miniature Robotics: Provides reliable performance in drones, RC cars, and small robotic joints.
