W 618/4
W Series Stainless Steel Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
W 618/4
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.0006 kg
Tolerance class
P0
Seal type
Open
For load direction
Radial
Main Dimensions
Bore diameter
4 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
9 mm
Outside diameter tolerance
-0.008mm to 0
Width
2.5 mm
Width tolerance
-0.12mm to 0
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
82 lbf
Radial static load rating
26 lbf
Limiting speed
85 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
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W 618/4 Bearing Product Overview & Core Advantages
The W 618/4 is a metric single row deep groove ball bearing designed for precision applications requiring compact dimensions and reliable performance. Constructed entirely from stainless steel, this open-type bearing offers excellent corrosion resistance and is capable of handling primarily radial loads. Its miniature size, with a 4 mm bore and 9 mm outside diameter, makes it ideal for space-constrained assemblies. The bearing operates effectively within a wide temperature range and complies with RoHS and REACH environmental standards, ensuring suitability for modern, demanding industrial applications.
W 618/4 Bearing Model Code Explained, Specifications & Naming Convention
The model designation W 618/4 can be broken down as follows:
Key specification codes referenced in the technical data:
- W: Manufacturer's series prefix.
- 618: Standard deep groove ball bearing series for miniature sizes.
- /4: Indicates a 4 mm bore diameter.
Key specification codes referenced in the technical data:
- P0: Standard tolerance class (Normal).
- CN: Standard radial internal clearance (Normal).
- Open: No seals or shields, allowing for higher limiting speeds and easy re-lubrication if required.
W 618/4 Bearing Structural Features & Performance Benefits
The design of the W 618/4 delivers distinct performance advantages:
- High-Speed Capability: The open design and stainless steel cage contribute to a high limiting speed of 85,000 rpm, making it suitable for high-speed spindles and small motors.
- Corrosion Resistance: All components, including rings, balls, and cage, are made from stainless steel, providing excellent protection against rust and corrosion in harsh environments.
- Precision Performance: Manufactured to P0 tolerance class with CN radial clearance, this bearing ensures smooth and precise operation, minimizing vibration and noise.
- Compact & Lightweight: With a width of just 2.5 mm and a weight of only 0.0006 kg, it is engineered for applications where minimal size and weight are critical.
W 618/4 Bearing Typical Application Areas
This miniature deep groove ball bearing is commonly specified in:
- Precision Instruments: Optical encoders, measuring devices, and laboratory equipment.
- Small Electric Motors: Miniature DC motors, stepper motors, and fan motors.
- Office Automation Equipment: Printers, scanners, and copiers.
- Medical Devices: Surgical handpieces, dental tools, and diagnostic equipment.
- Robotics and RC Models: Small joints, gearboxes, and drive systems.
