W 638/1.5 R-2Z
W Series Stainless Steel Flanged Miniature Bearings
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Part No.
Part No.
W 638/1.5 R-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
Outer Ring Dimensions
Flange outer diameter
5 mm
Flange thickness
0.6 mm
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
In Stock
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W 638/1.5 R-2Z Bearing Product Overview & Core Advantages
The W 638/1.5 R-2Z is a miniature deep groove ball bearing engineered for applications demanding compact size, reliable performance, and long service life. Constructed entirely from stainless steel, it offers excellent corrosion resistance. Its key advantage lies in its ability to handle radial loads efficiently within a very small envelope, making it an ideal solution for high-precision, space-constrained mechanisms. The inclusion of shielded seals and pre-lubrication ensures protected operation and reduced maintenance needs.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| W 638/1.5 | Bearing series and size designation. The bore diameter is 1.5 mm. |
| R | Indicates the bearing has a flange on the outer ring, which facilitates secure and simplified mounting. |
| 2Z | Signifies that the bearing is equipped with shields on both sides. This provides effective protection against contamination while allowing for high-speed operation compared to contact seals. |
W 638/1.5 R-2Z Bearing Structural Features & Performance Benefits
- Compact & Lightweight Design: With an overall dimension of just 4mm (OD) x 2mm (Width) and a weight of only 0.000102 kg, this bearing is designed for miniature applications where space and weight are critical factors.
- Flanged Outer Ring: The integrated flange (OD: 5mm) allows for easy axial location and simplifies the bearing housing design, reducing assembly time and cost.
- Shielded & Pre-lubricated: The non-contact 2Z shields protect the internal components from dust and debris without significantly increasing friction. Combined with factory-applied grease, this creates a maintenance-free solution for the bearing's operational life in many applications.
- Stainless Steel Construction: All components (rings, balls, cage) are made of stainless steel, providing excellent corrosion resistance and suitability for use in harsh environments or where cleanliness is required.
- Precision & Speed: Manufactured to P0 tolerance class and a limiting speed of 110,000 rpm, this bearing supports smooth and precise operation in high-speed miniature devices.
W 638/1.5 R-2Z Bearing Typical Application Areas
This bearing is ideally suited for a wide range of small-scale, precision equipment, including:
- Small DC Motors and Stepper Motors
- Precision Instruments and Optical Devices
- Medical Devices (e.g., surgical hand tools, dental drills)
- Office Automation Equipment (e.g., printers, scanners)
- Small Robotics and Drones
