W 639/3 R-2Z
W Series Stainless Steel Flanged Miniature Bearings
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Part No.
Part No.
W 639/3 R-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.000922 kg
Tolerance class
P0
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
3 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
8 mm
Outside diameter tolerance
-0.008mm to 0
Width
4 mm
Width tolerance
-0.12mm to 0
Outer Ring Dimensions
Flange outer diameter
9.5 mm
Flange thickness
0.9 mm
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
72 lbf
Radial static load rating
20 lbf
Limiting speed
75 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 639/3 R-2Z Bearing Product Overview & Core Advantages
The W 639/3 R-2Z is a metric miniature deep groove ball bearing designed for precision applications requiring compact dimensions and reliable performance. This single row bearing excels in handling radial loads and is characterized by its stainless steel construction, which provides excellent corrosion resistance. Its shielded design (2Z) and pre-lubrication offer robust protection against contamination and ensure long-term, maintenance-free operation, making it an ideal choice for high-speed, precision mechanisms where space is limited and reliability is critical.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| W 639/3 | Basic bearing series and size designation (3mm bore, 8mm OD). |
| R | Flanged outer ring design for secure axial location and simplified mounting. |
| 2Z | Non-contact shields on both sides, providing effective sealing against dust and debris while minimizing friction. |
W 639/3 R-2Z Bearing Structural Features & Performance Benefits
- Compact & Robust Design: The single row deep groove structure and integral flange (flange outer diameter: 9.5 mm) provide a space-saving solution with enhanced mounting stability and resistance to misalignment.
- High-Speed Capability: With a limiting speed of 75,000 rpm, this bearing is engineered for high-speed applications. The stainless steel cage and optimized grease lubrication contribute to smooth operation at elevated rotational speeds.
- Corrosion Resistance & Longevity: All components, including rings, balls, and cage, are manufactured from stainless steel, ensuring excellent performance in harsh or corrosive environments and contributing to a long service life.
- Maintenance-Free Operation: The combination of non-contact shields (2Z) and factory-applied grease effectively seals the bearing, retaining lubrication and excluding contaminants, resulting in a maintenance-free solution for the applied temperature range of -30°C to 120°C.
W 639/3 R-2Z Bearing Typical Application Areas
This miniature flanged bearing is ideally suited for applications demanding small bearing dimensions, high speed, and corrosion resistance. Key sectors include:
- Precision Instruments: Optical encoders, measuring devices, and small gauges.
- Small Motors and Drives: Stepper motors, miniature DC motors, and fan motors.
- Office Automation Equipment: Printers, scanners, and copiers.
- Medical Devices: Dental handpieces, small pumps, and laboratory equipment.
- Robotics and Automation: Small robotic joints, guidance systems, and sensors.
