W 638/4-2RS1
W Series Stainless Steel Miniature Bearings
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Part No.
Part No.
W 638/4-2RS1
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.001 kg
Tolerance class
P0
Seal type
Sealed
For load direction
Radial
Main Dimensions
Bore diameter
4 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
9 mm
Outside diameter tolerance
-0.008mm to 0
Width
4 mm
Width tolerance
-0.12mm to 0
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
82 lbf
Radial static load rating
26 lbf
Limiting speed
40 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
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In Stock
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W 638/4-2RS1 Bearing Product Overview & Core Advantages
The W 638/4-2RS1 is a metric miniature deep groove ball bearing designed for precision applications requiring compact dimensions and reliable performance. Constructed entirely from stainless steel, it offers excellent corrosion resistance. Its key advantage lies in its sealed design (2RS1) and pre-lubrication, providing protection against contaminants and ensuring long-term, maintenance-free operation. This bearing is engineered to primarily handle radial loads efficiently, making it an ideal choice for high-speed, compact mechanisms where space is at a premium and reliability is critical.
W 638/4-2RS1 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| W 638/4 | Basic bearing designation, indicating a deep groove ball bearing series with a 4 mm bore diameter. |
| -2RS1 | Signifies contact seals on both sides. The RS1 seal type provides effective protection against dust and moisture, retaining lubricant for extended service life. |
W 638/4-2RS1 Bearing Structural Features & Performance Benefits
- Compact & Robust Construction: The single-row design with a small cross-section (4mm width) allows for integration into extremely tight spaces without sacrificing performance.
- High Corrosion Resistance: Manufactured entirely from stainless steel (rings, balls, and cage), this bearing is suitable for applications exposed to moisture, chemicals, or demanding environments.
- Maintenance-Free Operation: The integral contact seals (2RS1) shield the internal components from contaminants and securely retain the factory-applied grease lubrication, enabling a long, maintenance-free service life.
- Precision & Speed: Built to P0 tolerance class and featuring optimized internal geometry, it supports smooth operation and a high limiting speed of 40,000 rpm, making it suitable for high-speed applications.
W 638/4-2RS1 Bearing Typical Application Areas
- Precision Instruments: Optical encoders, medical devices, and small measuring instruments.
- Small Motors & Drives: Stepper motors, miniature DC motors, and fan motors.
- Office Automation Equipment: Printers, scanners, and copiers.
- Robotics & Automation: Small robotic joints, guide rollers, and precision actuators.
- Consumer Electronics: Drones, small power tools, and high-speed spindles.
