W 618/2.5
W Series Stainless Steel Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
W 618/2.5
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.0002 kg
Tolerance class
P0
Seal type
Open
For load direction
Radial
Main Dimensions
Bore diameter
2.5 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
6 mm
Outside diameter tolerance
-0.008mm to 0
Width
1.8 mm
Width tolerance
-0.04mm to 0
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
26 lbf
Radial static load rating
8 lbf
Limiting speed
110 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 618/2.5 Bearing Product Overview & Core Advantages
The W 618/2.5 is a metric miniature deep groove ball bearing designed for applications demanding compact size and reliable performance. As a single row, open type bearing, it excels in handling radial loads efficiently. Manufactured entirely from stainless steel, it offers excellent corrosion resistance, making it suitable for various industrial environments. Its P0 tolerance class and CN radial internal clearance ensure consistent operation, while its extremely lightweight design (0.0002 kg) is ideal for space-constrained and precision mechanisms.
W 618/2.5 Bearing Model Code Explained, Specifications & Naming Convention
The model designation W 618/2.5 can be broken down as follows:
- W: Indicates a stainless steel bearing series.
- 618: Denotes the standard "618" series for miniature deep groove ball bearings.
- 2.5: Specifies the bore diameter of 2.5 mm.
- Seal type: Open - Allows for higher speeds and easy re-lubrication but requires a clean operating environment.
- Lubrication: None - Supplied without grease, providing flexibility for the user to apply a specialized lubricant suited for the specific application.
W 618/2.5 Bearing Structural Features & Performance Benefits
The bearing's performance is a direct result of its design and material selection:
- High Corrosion Resistance: Constructed from stainless steel rings, balls, and cage, the bearing is inherently resistant to rust and corrosion, ensuring longevity in harsh or washdown environments.
- Compact and Lightweight: With dimensions of 2.5 mm (bore) x 6 mm (OD) x 1.8 mm (width) and a minimal weight, it is engineered for miniature applications where size and mass are critical factors.
- Precision Performance: The P0 tolerance class (normal) and standardized CN radial internal clearance provide reliable and predictable running accuracy for a wide range of general-purpose applications.
- High-Speed Capability: The open design and stainless steel construction contribute to a high limiting speed of 110,000 rpm, making it suitable for high-speed spindles and small motors.
W 618/2.5 Bearing Typical Application Areas
This miniature deep groove ball bearing is ideally suited for:
- Small precision motors and stepper motors
- Medical and dental hand tools
- Optical encoders and instrumentation
- Office automation equipment (e.g., printers, scanners)
- RC models and drones
- Various low-load, high-speed mechanical systems
