W 618/9
W Series Stainless Steel Miniature Bearings
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Part No.
Part No.
W 618/9
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.0034 kg
Tolerance class
P0
Seal type
Open
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
4 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
53 X 1000 rpm
Lubrication
None
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
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W 618/9 Bearing Product Overview & Core Advantages
The W 618/9 is a metric single row deep groove ball bearing engineered for precision radial load applications. Constructed entirely from stainless steel (rings, balls, and cage), it offers excellent corrosion resistance. Its compact design, with a 9 mm bore and 4 mm width, provides a high-precision, space-saving solution for instruments and small machinery requiring reliable performance under radial dynamic loads up to 171 lbf. The open design and P0 tolerance class ensure smooth operation and consistent performance.
W 618/9 Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| W | Stainless Steel Deep Groove Ball Bearing series |
| 618 | Standard "618" series design, indicating a very light cross-section |
| 9 | Bore diameter of 9 mm |
| No Seal Suffix | The bearing is open, allowing for high-speed operation and easy re-lubrication if required. |
W 618/9 Bearing Structural Features & Performance Benefits
- All-Stainless-Steel Construction: Provides superior corrosion resistance, making it ideal for applications exposed to moisture, chemicals, or requiring washdown. The one-piece stainless steel cage ensures durability and smooth operation.
- High-Speed Capability: The open, low-friction design and precision manufacturing contribute to a high limiting speed of 53,000 rpm, suitable for demanding high-speed applications.
- Precision & Rigidity: Manufactured to P0 tolerance class and standard CN radial internal clearance, this bearing offers consistent running accuracy and stable support for shafts.
- Wide Temperature Range: Operates effectively in temperatures from -30°C to 120°C, accommodating various environmental conditions.
- Compliance: Meets ROHS and REACH standards, ensuring environmental and safety compliance for global markets.
W 618/9 Bearing Typical Application Areas
This bearing is ideally suited for:
- Precision Instruments: Optical encoders, measuring devices, and small medical instruments.
- Small Electric Motors: High-speed spindles in dental handpieces, small fans, and miniature drives.
- Office Automation Equipment: Printers, scanners, and copiers.
- Radio Control Models: High-performance motors in drones and RC cars.
- Any application requiring a compact, corrosion-resistant, and high-speed bearing for radial loads.
