1211 ETN9/C3
1200 Series Self Aligning Ball Bearings
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Basic Information
Main Dimensions
Inner Ring Dimensions
Outer Ring Dimensions
Performance
Materials
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1211 ETN9/C3 Bearing Product Overview & Core Advantages
The 1211 ETN9/C3 is a double row angular contact ball bearing designed for applications requiring high radial load capacity and operational stability. This precision bearing features an open design with a C3 radial internal clearance, making it suitable for applications with thermal expansion or where interference fits are used. Its double row construction provides high rigidity and enables it to handle significant combined loads. Pre-lubricated and equipped with a high-performance nylon cage (TN9), it offers reliable performance across a wide temperature range from -30°C to 110°C.
1211 ETN9/C3 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Performance Benefit |
|---|---|---|
| 1211 | Standard bore diameter (55 mm) and dimension series | Standardized bearing dimensions for easy replacement and integration |
| E | Optimized internal design | Enhanced load capacity and service life |
| TN9 | Nylon cage, glass fiber reinforced | Reduced friction, suitable for high-speed applications, quiet operation |
| C3 | Greater than normal radial internal clearance | Accommodates thermal expansion, ideal for applications with temperature variations |
1211 ETN9/C3 Bearing Structural Features & Performance Benefits
Double Row Design: Provides superior high rigidity and stability compared to single row bearings, making it ideal for applications with significant radial loads and moment loads.
Optimized Internal Geometry (E-design): Features increased ball complement and optimized raceway geometry to deliver higher radial dynamic load rating (6210 lbf) and extended service life.
TN9 Nylon Cage: The glass fiber reinforced polyamide cage contributes to lower friction, reduced heat generation, and enables higher limiting speeds (9,000 rpm), making it a true high-speed bearing.
C3 Radial Clearance: The larger internal clearance allows for thermal expansion in the shaft and housing, preventing preload and potential seizure in applications with elevated operating temperatures.
Pre-lubrication: Comes with initial lubrication, ensuring immediate operational readiness and protection during the run-in period.
1211 ETN9/C3 Bearing Typical Application Areas
- Electric Motors: Ideal for medium-sized motors requiring high radial load capacity and high-speed operation.
- Industrial Gearboxes: Used in gearbox designs where high rigidity and stability under radial loads are critical.
- Material Handling Equipment: Conveyor pulleys, rollers, and other components that experience significant radial forces.
- Agricultural Machinery: Implements and machinery requiring robust bearings with higher internal clearance for dirty environments.
- General Industrial Machinery: Pumps, fans, and other rotating equipment where reliable performance under combined loads is essential.
