W 618/7 R
W Series Stainless Steel Flanged Miniature Bearings
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Part No.
Part No.
W 618/7 R
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.0024 kg
Tolerance class
P0
Seal type
Open
For load direction
Radial
Main Dimensions
Bore diameter
7 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
14 mm
Outside diameter tolerance
-0.008mm to 0
Width
3.5 mm
Width tolerance
-0.12mm to 0
Outer Ring Dimensions
Flange outer diameter
16 mm
Flange thickness
1 mm
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
149 lbf
Radial static load rating
58 lbf
Limiting speed
63 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 618/7 R Bearing Product Overview & Core Advantages
The 618/7 R is a miniature flanged deep groove ball bearing designed for compact applications requiring high precision and reliable performance. This single row bearing excels in handling radial loads efficiently. Its open design and construction from stainless steel throughout (rings, balls, and cage) provide excellent corrosion resistance, making it suitable for demanding environments. The integral flange ensures secure mounting and precise positioning, offering a robust solution for space-constrained assemblies.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 618 | Series designation for extra small, thin-section deep groove ball bearings. |
| 7 | Bore diameter of 7 mm. |
| R | Designates a flanged outer ring for simplified mounting and axial location. |
| (No Seal Code) | The bearing is open (no seals or shields), allowing for higher potential speeds and custom lubrication. |
W 618/7 R Bearing Structural Features & Performance Benefits
- Compact & Lightweight Design: With an overall width of just 3.5 mm and a weight of only 0.0024 kg, this bearing is ideal for applications where size and mass are critical constraints.
- High Corrosion Resistance: Manufactured entirely from stainless steel, it offers superior performance in humid or corrosive environments, ensuring long service life.
- Flanged Outer Ring: The flange (16 mm outer diameter) facilitates easy installation and accurate axial positioning, enhancing assembly rigidity and stability.
- Precision & Speed Capability: Built to P0 tolerance class with standard CN radial internal clearance, it ensures consistent performance. The open structure and stainless steel cage contribute to a high limiting speed of 63,000 rpm.
- Versatile Lubrication Options: As a non-lubricated (None), open bearing, it provides the flexibility to be lubricated with a grease or oil most suitable for the specific application requirements.
W 618/7 R Bearing Typical Application Areas
This miniature flanged bearing is commonly specified in:
- Small Precision Motors and stepper motors
- Medical Devices and dental handpieces
- Optical Encoders and precision instrumentation
- Office Automation Equipment (e.g., printers, scanners)
- Robotics and small gearboxes
- Various miniature mechanical systems requiring reliable, compact radial support
