638zz
600 Series Miniature Bearings
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Basic Information
Main Dimensions
Inner Ring Dimensions
Ball & Washer Dimensions
Performance
Materials
Environment & Compliance
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638zz Bearing Product Overview & Core Advantages
The 638zz is a single row deep groove ball bearing designed for exceptional performance in demanding applications. As a metric precision bearing with shielded construction, it offers reliable operation and protection against contamination. Its primary advantage lies in its ability to efficiently handle radial loads while also accommodating moderate axial loads in both directions. The compact design, featuring an 8 mm bore and 28 mm outside diameter, makes it an ideal choice for applications where space is limited and high reliability is paramount. Manufactured to ABEC1 tolerance standards, it ensures consistent performance and smooth operation.
638zz Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 63 | Bearing series, indicating a specific dimension series with a 8mm bore. |
| 8 | Bore diameter code, representing a 8 mm bore. |
| zz | Signifies the presence of non-contact metal shields (ZZ) on both sides. This provides effective protection against dust and debris while minimizing friction, contributing to a higher limiting speed. |
638zz Bearing Structural Features & Performance Benefits
- Optimized Load Capacity: The deep groove raceway and precision-engineered geometry enable the bearing to carry significant radial dynamic load ratings of 873 lbf and handle combined loads effectively.
- High-Speed Capability: The combination of a low-friction stainless steel cage, precision chrome steel components, and non-contact shields allows for a high limiting speed of 28,000 rpm.
- Precision and Rigidity: Manufactured to ABEC1 tolerances with a controlled radial internal clearance (MC3 group: 0.002mm to 0.013mm), this bearing ensures smooth, quiet, and precise rotation, minimizing vibration.
- Durability and Corrosion Resistance: The use of 300 Series Stainless Steel for the shields and cage enhances corrosion resistance, extending service life in various environments.
638zz Bearing Typical Application Areas
The 638zz bearing is widely used in applications requiring compact size, high speed, and reliable performance. Key industries and equipment include:
- Electric Motors and small power tools
- Precision Instruments and optical devices
- Office machinery such as printers and scanners
- Small pumps, fans, and blowers
- Radio-controlled models and drones
