W 638/3-2Z
W Series Stainless Steel Miniature Bearings
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W 638/3-2Z Bearing Product Overview & Core Advantages
The W 638/3-2Z is a metric single row deep groove ball bearing designed for precision applications requiring compact dimensions and reliable performance. Constructed entirely from stainless steel, it offers excellent corrosion resistance. Its key advantage lies in its ability to efficiently handle radial loads while its shielded design (2Z) provides effective contamination protection, making it ideal for applications demanding high reliability and long service life with minimal maintenance.
W 638/3-2Z Bearing Model Code Explained, Specifications & Naming Convention
- W 638/3: Basic model number denoting a single row deep groove ball bearing with a 3 mm bore diameter.
- -2Z: Signifies that the bearing is shielded on both sides. This provides superior protection against contaminants like dust and debris while retaining the pre-applied lubricant.
W 638/3-2Z Bearing Structural Features & Performance Benefits
This bearing's performance is defined by its robust construction. The single row deep groove raceway is optimized for smooth operation under radial dynamic loads (rated at 40 lbf). The use of stainless steel for all components (rings, balls, cage) ensures consistent performance and resistance to corrosion in challenging environments. The integral shields (2Z) are a critical feature, sealing in the factory-applied grease lubrication and sealing out contaminants. This combination results in a maintenance-free solution with a limiting speed of 80,000 rpm and a stable operating temperature range from -30°C to 120°C.
W 638/3-2Z Bearing Typical Application Areas
The W 638/3-2Z is engineered for compact, high-speed devices. Its typical applications include:
- Small Precision Motors and stepper motors
- Medical Devices and dental handpieces
- Optical Encoders and instrumentation
- Small Fans and blowers
- Office automation equipment and miniature gearboxes
