W 638/4 X-2RS1
W Series Stainless Steel Miniature Bearings
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Part No.
Part No.
W 638/4 X-2RS1
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.0013 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
10 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
124 lbf
Radial static load rating
55 lbf
Limiting speed
36 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 X-2RS1 Bearing Product Overview & Core Advantages
The W 638/4 X-2RS1 is a metric miniature deep groove ball bearing designed for precision applications requiring compact dimensions and reliable performance. This single row bearing excels at handling primarily radial loads and is characterized by its sealed construction, which provides excellent protection against contamination. Manufactured entirely from stainless steel, it offers superior corrosion resistance, making it ideal for applications demanding high reliability and long service life in challenging environments.
W 638/4 X-2RS1 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| W 638/4 | Basic bearing designation, indicating a miniature deep groove ball bearing series with a 4 mm bore diameter. |
| X | Internal design code, specific to the manufacturer. |
| 2RS1 | Indicates the bearing is fitted with contact seals on both sides. The "RS1" suffix denotes a specific seal design, typically made of NBR rubber, providing effective protection against dust and moisture. |
W 638/4 X-2RS1 Bearing Structural Features & Performance Benefits
- Compact & Robust Design: The single row deep groove structure and compact dimensions (4x10x4 mm) allow for integration into space-constrained assemblies without compromising performance.
- Effective Sealing: The 2RS1 contact seals on both sides effectively shield the internal components from contaminants like dust and moisture, significantly extending the bearing's operational life and reducing maintenance needs.
- Corrosion Resistance: Constructed entirely from stainless steel (rings, balls, and cage), this bearing is highly resistant to corrosion, ensuring reliable performance in humid or chemically aggressive environments.
- Precision & Smooth Operation: Built to P0 tolerance class with a standard CN radial internal clearance, it ensures smooth running and precise rotation, which is critical for sensitive instrumentation.
- Ready-to-Use Lubrication: The bearing is pre-lubricated with grease, making it maintenance-free for the majority of its service life under normal operating conditions within its specified temperature range.
W 638/4 X-2RS1 Bearing Typical Application Areas
This bearing is ideally suited for applications requiring miniature size, corrosion resistance, and reliable sealed performance. Common uses include:
- Precision Instruments: Optical encoders, measuring devices, and small gauges.
- Small Electric Motors: Miniature DC motors, stepper motors, and fan motors.
- Office Automation Equipment: Printers, scanners, and copiers.
- Medical Devices: Small handheld medical and dental tools.
- Robotics: Small joints and actuators in robotic arms.
