W 638/5 R-2Z
W Series Stainless Steel Flanged Miniature Bearings
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Basic Information
Main Dimensions
Outer Ring Dimensions
Performance
Materials
Environment & Compliance
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W 638/5 R-2Z Bearing Product Overview & Core Advantages
The W 638/5 R-2Z is a single row deep groove ball bearing designed for exceptional performance in compact spaces. Constructed entirely from stainless steel, it offers excellent corrosion resistance. Its key advantage lies in its ability to handle radial loads efficiently while its integral flange provides secure and simplified mounting, ensuring precise alignment. Pre-lubricated with grease and featuring shielded (2Z) construction, this bearing is a ready-to-install, low-maintenance solution for applications demanding high reliability and a long service life.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| W 638/5 | Basic bearing designation indicating a flanged, single row deep groove ball bearing series with a 5 mm bore diameter. |
| R | Designates the presence of a flange on the outer ring for easy mounting and positioning. |
| 2Z | Signifies shielded on both sides. The non-contact shields protect against contamination while minimizing friction, contributing to the high limiting speed. |
W 638/5 R-2Z Bearing Structural Features & Performance Benefits
- Compact & Robust Flange Design: The outer ring flange (Ø12.5 mm) simplifies assembly, reduces the need for complex housing designs, and provides excellent axial location, enhancing overall system rigidity.
- High-Grade Stainless Steel Construction: All components, including rings, balls, and cage, are made from stainless steel, ensuring superior corrosion resistance and suitability for harsh environments.
- Optimized for High-Speed Operation: The combination of a deep groove raceway, a stainless steel cage, and non-contact shields allows for a high limiting speed of 60,000 rpm, making it an ideal high-speed bearing.
- Maintenance-Free & Long-Lasting: The bearing is pre-lubricated with grease and sealed with 2Z shields, effectively retaining lubrication and excluding contaminants. This design ensures long-term, maintenance-free operation within a wide temperature range of -30°C to 120°C.
- Precision and Reliability: Manufactured to P0 tolerance class with standard CN radial internal clearance, it guarantees consistent performance and smooth running for precision applications.
W 638/5 R-2Z Bearing Typical Application Areas
The W 638/5 R-2Z is engineered for high-performance miniature and instrument applications, including:
- Small Precision Motors (e.g., stepper motors, DC micromotors)
- Medical and Dental Handpieces
- Optical Encoders and Scanners
- Office Automation Equipment (e.g., printers, scanners)
- Robotics and Miniature Gearboxes
- Radio-Controlled Models and Drones
