W 604
W Series Stainless Steel Miniature Bearings
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Part No.
Part No.
W 604
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.002 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
12 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
121 lbf
Radial static load rating
40 lbf
Limiting speed
80 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 604 Bearing Product Overview & Core Advantages
The W 604 is a metric single row deep groove ball bearing designed for high-precision radial load applications. Constructed entirely from stainless steel, it offers excellent corrosion resistance and is suitable for environments where contamination must be minimized. With its compact dimensions (4mm bore, 12mm OD) and open design, it facilitates efficient heat dissipation and is ideal for applications requiring high limiting speeds. Its P0 tolerance class ensures reliable performance in a wide range of precision machinery and instruments.
W 604 Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| W | Stainless Steel Deep Groove Ball Bearing series designation. |
| 604 | Standard bearing size code indicating a 4mm bore, 12mm outside diameter, and 4mm width. |
| Open | No seals or shields, allowing for higher speeds and easy re-lubrication if required. |
| P0 | Standard (Normal) tolerance class per ISO standards. |
| CN | Normal radial internal clearance group. |
W 604 Bearing Structural Features & Performance Benefits
- All-Stainless-Steel Construction: The rings, balls, and cage are manufactured from stainless steel, providing superior corrosion resistance and making the bearing suitable for washdown environments, medical equipment, and food processing applications.
- Optimized for Radial Loads: The deep groove raceway and single row design are engineered to efficiently support high radial dynamic load ratings (121 lbf).
- High-Speed Capability: The open seal type and precision-ground components minimize friction and heat generation, enabling a high limiting speed of 80,000 rpm.
- Precision Engineering: Manufactured to P0 tolerance class with a controlled CN radial internal clearance, ensuring consistent performance, low noise, and smooth operation in precision assemblies.
- Compact and Lightweight: With a minimal cross-section and a weight of only 0.002 kg, it helps reduce the size and inertia of the overall mechanism.
W 604 Bearing Typical Application Areas
- Precision Instruments and Optical Devices
- Small Electric Motors and Spindles
- Medical and Dental Handpieces
- Office Automation Equipment (e.g., printers, scanners)
- Robotics and Small Gearboxes
- Food and Beverage Machinery (where corrosion resistance is critical)
