W 618/8-2Z
W Series Stainless Steel Miniature Bearings
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Part No.
Part No.
W 618/8-2Z
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.0031 kg
Tolerance class
P0
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
8 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
16 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
161 lbf
Radial static load rating
67 lbf
Limiting speed
45 X 1000 rpm
Lubrication
Grease
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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In Stock
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W 618/8-2Z Bearing Product Overview & Core Advantages
The W 618/8-2Z is a single row deep groove ball bearing designed for precision applications requiring high reliability. This metric bearing features stainless steel construction throughout (rings, balls, and cage) and integrated shields (2Z) for contamination protection. Its compact design, with a 4 mm width and 8 mm bore, provides excellent space-saving solutions while maintaining robust radial load capacity. Pre-lubricated with grease, it offers immediate operation and is suitable for a wide temperature range from -30°C to 120°C, making it ideal for applications demanding corrosion resistance and consistent performance.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| W | Stainless Steel Bearing Series |
| 618 | Extra Small & Light Series, Deep Groove Design |
| 8 | Bore Diameter: 8 mm |
| 2Z | Non-Contact Shields on Both Sides (Dust Protection) |
W 618/8-2Z Bearing Structural Features & Performance Benefits
- Superior Corrosion Resistance: Complete stainless steel construction (AISI 440 rings and balls, stainless steel cage) ensures excellent performance in harsh, corrosive environments and meets ROHS/REACH compliance.
- Optimized Radial Load Capacity: The deep groove geometry and precision-ground components enable efficient handling of radial dynamic loads up to 161 lbf and static loads up to 67 lbf.
- Enhanced Contamination Protection: The non-contact shields (2Z) effectively exclude contaminants while minimizing friction, contributing to the limiting speed of 45,000 rpm.
- Low Maintenance & Long Service Life: Pre-lubricated with high-quality grease and featuring standard CN radial internal clearance, this bearing requires no relubrication under normal operating conditions, reducing maintenance needs.
- Precision Engineering: Manufactured to P0 tolerance class with tight dimensional tolerances (bore/OD: -0.008mm to 0), ensuring smooth operation and precise shaft positioning.
W 618/8-2Z Bearing Typical Application Areas
- Precision Instruments: Optical encoders, measuring devices, and laboratory equipment
- Small Electric Motors: Miniature DC motors, stepper motors, and fan motors
- Medical Devices: Dental handpieces, surgical tools, and diagnostic equipment
- Office Automation: Printers, scanners, and copier mechanisms
- Food Processing Equipment: Where corrosion resistance and cleanliness are critical
