W 638-2Z
W Series Stainless Steel Miniature Bearings
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Part No.
Part No.
W 638-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.028 kg
Tolerance class
P0
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
8 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
28 mm
Outside diameter tolerance
-0.009mm to 0
Width
9 mm
Width tolerance
-0.12mm to 0
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
892 lbf
Radial static load rating
441 lbf
Limiting speed
32 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 638-2Z Bearing Product Overview & Core Advantages
The W 638-2Z is a metric single row deep groove ball bearing designed for exceptional performance in demanding applications. Constructed entirely from stainless steel, it offers superior corrosion resistance. Its key advantage lies in its ability to handle significant radial loads while its shielded (2Z) design retains factory-fresh grease lubrication, ensuring long-term, maintenance-free operation. This combination makes it an ideal, compact solution for applications requiring high reliability and a P0 tolerance class.
Model Code In-Depth Explanation
| Code Segment | Technical Meaning |
|---|---|
| W | Stainless Steel Bearing Series |
| 638 | Bore Diameter 8 mm, Outside Diameter 28 mm, Width 9 mm |
| 2Z | Bearing with Shields on Both Sides for contaminant protection and grease retention. |
W 638-2Z Bearing Structural Features & Performance Benefits
- Robust Single Row Design: The deep groove raceway and stainless steel cage provide stable operation and effective radial load capacity, with a dynamic rating of 892 lbf.
- Shielded for Protection: The 2Z shields protect the bearing from dust and other contaminants while effectively sealing in the lubricant, significantly extending service life without maintenance.
- Pre-Lubricated for Longevity: Filled with high-quality grease, the bearing is ready for immediate use and operates reliably within a temperature range of -30° to 120 °C.
- High-Speed Capability: The optimized design and lubrication enable a limiting speed of 32,000 rpm, making it suitable for high-speed applications.
W 638-2Z Bearing Typical Application Areas
This bearing is ideally suited for:
- Electric Motors and Small Gearboxes
- Medical and Dental Equipment (due to stainless steel construction and RoHS/REACH compliance)
- Food Processing Machinery
- Precision Instruments and Optical Devices
- Office Automation Equipment such as printers and scanners
