W 628/8 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 628/8 R-2Z Bearing Product Overview & Core Advantages
The W 628/8 R-2Z is a single row deep groove ball bearing designed for exceptional performance in compact spaces. Engineered with stainless steel components, it offers excellent corrosion resistance and reliability. A key feature is its integral shielded design (2Z) and pre-lubrication with grease, making it a maintenance-free solution ideal for applications requiring long service life and protection from contaminants. Its robust construction provides high radial load capacity and stable operation at limiting speeds up to 45,000 rpm, making it a superior choice for precision mechanisms.
W 628/8 R-2Z Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| W 628/8 | Basic bearing designation, indicating a single row deep groove ball bearing with an 8 mm bore diameter. |
| R | Denotes a flanged outer ring, which facilitates precise axial location and simplifies housing design. |
| 2Z | Signifies shields on both sides. This provides effective protection against solid contaminants while retaining grease, contributing to the bearing's maintenance-free characteristic. |
W 628/8 R-2Z Bearing Structural Features & Performance Benefits
- Compact & Robust Flange Design: The flanged outer ring (R suffix) ensures easy and secure mounting, providing excellent axial location and stability within the assembly, which is critical for high-speed operation.
- Superior Sealing & Lubrication: The non-contact shields (2Z) on both sides effectively protect the rolling elements from dust and debris without significantly increasing friction. Combined with pre-applied grease, this ensures long-term, maintenance-free operation across the specified temperature range.
- High-Speed Capability: The precision-ground stainless steel raceways and balls, along with an optimized cage, enable smooth operation at limiting speeds of 45,000 rpm.
- Corrosion Resistance: Constructed entirely from stainless steel, including the rings, balls, and cage, this bearing is ideally suited for applications exposed to moisture, chemicals, or demanding environments.
W 628/8 R-2Z Bearing Typical Application Areas
The W 628/8 R-2Z is ideally suited for a wide range of compact and precision applications, including:
- Small Electric Motors and Miniature Gearboxes
- Medical Devices and Laboratory Equipment
- Office Automation Equipment (e.g., printers, scanners)
- Precision Instruments and Optical Devices
- Food Processing Machinery (benefiting from its stainless steel construction and sealed design)
