W 618/3
W Series Stainless Steel Miniature Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
W 618/3
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.0003 kg
Tolerance class
P0
Seal type
Open
For load direction
Radial
Main Dimensions
Bore diameter
3 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
7 mm
Outside diameter tolerance
-0.008mm to 0
Width
2 mm
Width tolerance
-0.12mm to 0
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
40 lbf
Radial static load rating
13 lbf
Limiting speed
100 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
Price:
$ 2.76
/ each
In Stock
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
W 618/3 Bearing Product Overview & Core Advantages
The W 618/3 is a metric miniature deep groove ball bearing engineered for precision applications requiring compact dimensions and reliable performance. Constructed entirely from stainless steel, it offers excellent corrosion resistance. As a single row bearing with an open design, it is optimized for high-speed operation and is primarily designed to support radial loads. Its small size, with a 3 mm bore and 7 mm outside diameter, makes it ideal for applications where space is at a premium, while its P0 tolerance class ensures consistent and precise operation.
W 618/3 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| W | Designates a stainless steel deep groove ball bearing. |
| 618/3 | Indicates the bearing series (618) and a 3 mm bore diameter. |
| (No Suffix) | The absence of additional suffixes confirms an open (unsealed) design and standard CN radial internal clearance. |
W 618/3 Bearing Structural Features & Performance Benefits
- All-Stainless-Steel Construction: The rings, balls, and cage are made from stainless steel, providing superior corrosion resistance and suitability for harsh environments or washdown applications.
- High-Speed Capability: The open design and precision manufacturing contribute to a high limiting speed of 100,000 rpm, making it an excellent high-speed bearing for miniature applications.
- Precision Performance: Manufactured to P0 tolerance class and standard CN radial internal clearance, this bearing ensures smooth, low-vibration, and accurate running, which is critical in precision instruments.
- Compact and Lightweight: With a minimal cross-section and a weight of only 0.0003 kg, it is designed for applications with severe space and weight constraints.
W 618/3 Bearing Typical Application Areas
This miniature deep groove ball bearing is commonly used in:
- Small precision electric motors
- Medical and dental handpieces
- Optical encoders and instrumentation
- Office automation equipment (e.g., small printers, scanners)
- RC models and drones
- High-speed spindles in miniature machinery
