W 638/4 X-2Z
W Series Stainless Steel Miniature Bearings
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Part No.
Part No.
W 638/4 X-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.0013 kg
Tolerance class
P0
Seal type
Shielded
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
63 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-2Z Bearing Product Overview & Core Advantages
The W 638/4 X-2Z is a metric, single row deep groove ball bearing designed for high performance in compact spaces. Engineered from stainless steel and featuring integral shields (2Z) with pre-applied grease lubrication, this bearing is built for reliable operation, offering excellent resistance to corrosion and contamination. Its primary strengths include a high limiting speed and the ability to handle significant radial loads, making it an ideal choice for applications demanding precision, longevity, and minimal maintenance.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| W 638/4 | Bearing series and size designation (4mm bore, 10mm OD). |
| X | Designates a specific internal design or variant. |
| 2Z | Signifies bearings with shields on both sides. This provides effective protection against contamination while allowing for higher speeds compared to contact seals. |
W 638/4 X-2Z Bearing Structural Features & Performance Benefits
- Robust Single Row Design: The deep groove raceway and stainless steel construction provide a robust solution for handling radial dynamic loads up to 124 lbf, ensuring stable performance.
- High-Speed Capability: The combination of a stainless steel cage and optimized grease lubrication enables a high limiting speed of 63,000 rpm, suitable for demanding high-speed applications.
- Maintenance-Free & Corrosion Resistant: The 2Z shields retain the lubricant and effectively exclude contaminants. Combined with the all-stainless-steel components, this results in a long-service-life, maintenance-free bearing that operates reliably within a temperature range of -30°C to 120°C.
- Precision & Consistency: Manufactured to P0 tolerance class and standard CN radial internal clearance, this bearing ensures consistent running accuracy and smooth operation.
W 638/4 X-2Z Bearing Typical Application Areas
This versatile miniature bearing is ideally suited for:
- Small Precision Motors and Stepper Motors
- Medical and Dental Handpieces
- Office Automation Equipment (e.g., printers, scanners)
- Instrumentation and Precision Mechanical Systems
- Radio Control Models and Small Fans
