208-ZNR
200 Series Snap Ring Bearings
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Basic Information
Main Dimensions
Outer Ring Dimensions
Performance
Materials
Environment & Compliance
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208-ZNR Bearing Product Overview & Core Advantages
The 208-ZNR is a single row deep groove ball bearing designed for superior performance in demanding applications. This metric bearing excels in handling primarily radial loads with high efficiency. A key distinguishing feature is the integral snap ring on the outer ring, which facilitates secure axial location within a housing, simplifying assembly and reducing overall design space. Manufactured from high-grade chrome steel and featuring a stainless steel cage, it offers excellent durability and consistent operation. Pre-lubricated with grease and fitted with shields (Z), the 208-ZNR provides robust protection against contamination, making it a reliable, low-maintenance solution for a wide range of industrial machinery.
208-ZNR Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 208 | Basic bearing designation, indicating a metric series deep groove ball bearing with a 40mm bore and 80mm outside diameter. |
| Z | Denotes a non-contact shield on one side of the bearing. This provides effective protection against large particulate contaminants while maintaining low friction. |
| NR | Indicates the outer ring has a snap ring groove and a fitted snap ring. This feature allows for simplified axial location within a housing, eliminating the need for complex housing shoulders or end caps. |
208-ZNR Bearing Structural Features & Performance Benefits
- Snap Ring for Secure Location: The integrated snap ring (outer ring locating feature) ensures the bearing is positively located in the axial direction, enhancing operational stability and simplifying the design of the surrounding housing structure.
- Robust Contamination Protection: The shielded (Z) design effectively seals the bearing against dust and other contaminants, extending service life and reliability, particularly in less-than-ideal environments.
- High Load Capacity & Durability: Constructed from chrome steel rings and balls, the bearing offers a high radial dynamic load rating of 7554 lbf and a radial static load rating of 6070 lbf, ensuring long-term performance under significant loads.
- Optimized for Speed & Temperature: The standard CN radial internal clearance and stainless steel cage contribute to smooth operation at its limiting speed of 9,500 rpm. The pre-applied grease lubrication supports a broad operating temperature range from -30°C to 120°C.
- Maintenance-Friendly: The combination of shields and factory-applied grease makes this a sealed and pre-lubricated unit, designed for long service intervals with minimal maintenance requirements.
208-ZNR Bearing Typical Application Areas
The 208-ZNR is ideally suited for applications requiring reliable radial load support and simplified mounting. Common uses include:
- Electric Motors and Gearboxes
- Industrial Pumps and Fans
- Material Handling Equipment (e.g., conveyor rollers)
- Agricultural and Construction Machinery
- Various Automotive Components
