W 639/2 R-2Z
W Series Stainless Steel Flanged Miniature Bearings
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Part No.
Part No.
W 639/2 R-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.000408 kg
Tolerance class
P0
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
2 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
6 mm
Outside diameter tolerance
-0.008mm to 0
Width
3 mm
Width tolerance
-0.04mm to 0
Outer Ring Dimensions
Flange outer diameter
7.5 mm
Flange thickness
0.8 mm
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
43 lbf
Radial static load rating
11 lbf
Limiting speed
90 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
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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W 639/2 R-2Z Bearing Product Overview & Core Advantages
The W 639/2 R-2Z is a miniature single row deep groove ball bearing engineered for precision applications requiring compact design and reliable performance. Constructed entirely from stainless steel, it offers excellent corrosion resistance. Its key advantages include the ability to handle radial loads efficiently, a shielded design (2Z) for contaminant protection, and pre-lubrication for maintenance-free operation. This combination makes it ideal for applications demanding high reliability in a minimal footprint.
W 639/2 R-2Z Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| W 639/2 | Basic bearing series, indicating a specific miniature deep groove ball bearing design. |
| R | Identifies the bearing as having a flanged outer ring, which aids in axial location and simplifies housing design. |
| 2Z | Signifies non-contact shields on both sides. This provides effective protection against contaminants while minimizing friction, contributing to the high limiting speed. |
W 639/2 R-2Z Bearing Structural Features & Performance Benefits
- Compact & Lightweight Design: With a bore diameter of 2 mm and a weight of only 0.000408 kg, this bearing is perfect for space-constrained and weight-sensitive applications.
- Flanged Outer Ring: The flange (7.5 mm outer diameter) ensures easy and secure axial positioning, simplifying assembly and reducing overall costs.
- Shielded for Protection: The 2Z shields retain grease and protect the internal components from dust and other particles, enhancing service life without significant speed penalties.
- Stainless Steel Construction: All components (rings, balls, cage) are made from stainless steel, providing excellent resistance to corrosion and enabling use in harsh environments.
- Pre-lubricated & Ready-to-Use: Filled with grease, the bearing is lubricated for life under normal operating conditions (-30° to 120 °C), ensuring maintenance-free operation.
- High-Speed Capability: The optimized design and shields allow for a limiting speed of 90,000 rpm, making it suitable for high-speed miniature devices.
W 639/2 R-2Z Bearing Typical Application Areas
This miniature flanged bearing is commonly specified in:
- Precision Small Motors: Such as those used in drones, miniature fans, and medical devices.
- Instrumentation and Control Systems: Including encoders, sensors, and small actuators.
- Office Automation Equipment: Like small printers, scanners, and copiers.
- Medical and Dental Handpieces: Where compact size, corrosion resistance, and high speed are critical.
- Robotics: Particularly in small joints and miniature gearboxes.
