W 638/9-2Z
W Series Stainless Steel Miniature Bearings
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Part No.
Part No.
W 638/9-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.005 kg
Tolerance class
P0
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
9 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
17 mm
Outside diameter tolerance
-0.008mm to 0
Width
6 mm
Width tolerance
-0.12mm to 0
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
171 lbf
Radial static load rating
75 lbf
Limiting speed
43 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 638/9-2Z Bearing Product Overview & Core Advantages
The W 638/9-2Z is a metric single row deep groove ball bearing designed for exceptional performance in compact spaces. Engineered with stainless steel components throughout, it offers excellent corrosion resistance. Its key advantage lies in its ability to handle radial loads efficiently while also accommodating moderate axial loads in both directions. The integral shielded design and pre-lubrication make it a robust, low-maintenance solution for applications demanding high reliability and a long service life.
W 638/9-2Z Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| W 638/9 | Basic bearing designation, indicating a deep groove ball bearing series with a 9 mm bore diameter. |
| -2Z | Signifies that the bearing is equipped with non-contact shields on both sides. This provides effective protection against contamination while minimizing friction, contributing to the high limiting speed. |
W 638/9-2Z Bearing Structural Features & Performance Benefits
- Robust Construction: Manufactured entirely from stainless steel (rings, balls, and cage), this bearing provides superior corrosion resistance and durability in harsh environments.
- Optimized Load Capacity: The single row deep groove raceway geometry is precision-engineered to support significant radial dynamic loads (171 lbf) and moderate axial loads.
- High-Speed Capability: The combination of the low-friction 2Z shields and a stainless steel cage allows for a high limiting speed of 43,000 rpm, making it suitable for high-speed applications.
- Maintenance-Free Operation: The bearing is pre-lubricated with grease and sealed with shields, creating a sealed-for-life unit that requires no relubrication, reducing long-term maintenance costs.
- Precision & Stability: Built to P0 tolerance class and standard CN radial internal clearance, it ensures consistent performance, smooth operation, and precise rotation.
W 638/9-2Z Bearing Typical Application Areas
- Small Electric Motors and Miniature Gearboxes
- Precision Instruments and Optical Devices
- Medical Equipment and Dental Handpieces
- Office Automation Equipment (e.g., printers, scanners)
- Food Processing Machinery (benefiting from its stainless steel construction and sealed design)
- Various Low-Torque, High-Speed Mechanisms
