W 639/3 R-2RS1
W Series Stainless Steel Flanged Miniature Bearings
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Part No.
Part No.
W 639/3 R-2RS1
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.000922 kg
Tolerance class
P0
Seal type
Sealed
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
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 639/3 R-2RS1 Bearing Product Overview & Core Advantages
The W 639/3 R-2RS1 is a single row deep groove ball bearing designed for exceptional performance in compact spaces. This metric bearing features a fully sealed construction and is manufactured entirely from stainless steel, providing excellent corrosion resistance. Its core advantages include high reliability for radial loads, smooth operation at limiting speeds up to 43,000 rpm, and long service life due to its pre-lubricated and sealed design, making it ideal for applications demanding precision and durability.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| W 639/3 | Basic bearing designation, indicating a specific single row deep groove ball bearing series with a 3 mm bore. |
| R | Flanged outer ring design, providing ease of mounting and axial location. |
| 2RS1 | Contact seals on both sides. The "RS1" suffix denotes low-friction, synthetic rubber seals that effectively retain grease and exclude contaminants. |
W 639/3 R-2RS1 Bearing Structural Features & Performance Benefits
- Robust Stainless Steel Construction: All components, including rings, balls, and cage, are made from stainless steel, offering superior corrosion resistance and suitability for harsh environments.
- Effective Sealing with 2RS1: The double-sided contact seals provide excellent protection against contamination and grease leakage, ensuring a maintenance-free and long operational life.
- Flanged Outer Ring (R): The integral flange simplifies bearing housing design, facilitates accurate axial positioning, and allows for secure mounting, enhancing overall assembly rigidity.
- Optimized for High Speeds: The combination of a deep groove raceway, a stainless steel cage, and effective sealing enables reliable performance at high limiting speeds.
- Pre-lubricated with Grease: Factory-filled grease provides immediate lubrication upon installation, suitable for the specified temperature range of -30°C to +120°C.
W 639/3 R-2RS1 Bearing Typical Application Areas
This bearing is ideally suited for small, precision mechanisms requiring high-speed operation and reliability. Common applications include:
- Small Electric Motors (e.g., in drones, precision tools)
- Medical and Dental Handpieces
- Office Automation Equipment (printers, scanners)
- Precision Instruments and Optical Devices
- Radio-Controlled Models and Miniature Gearboxes
