311-2ZNR
300 Series Snap Ring Bearings
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Part No.
Part No.
311-2ZNR
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
1.5 kg
Tolerance class
P0
Seal type
Shielded
For load direction
Radial
Main Dimensions
Bore diameter
55 mm
Bore diameter tolerance
-0.015mm to 0
Outside diameter
120 mm
Outside diameter tolerance
-0.015mm to 0
Width
29 mm
Width tolerance
-0.15mm to 0
Outer Ring Dimensions
Outer ring locating feature
Snap Ring (fitted)
Outside diameter of snap ring
129.7 mm
Width of snap ring
2.82 mm
Performance
Temperature range
-30° to 120 °C
Radial dynamic load rating
17805 lbf
Radial static load rating
15062 lbf
Limiting speed
5 X 1000 rpm
Lubrication
Grease
Radial internal clearance
CN
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Stainless Steel
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
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In Stock
Price available upon request.
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311-2ZNR Bearing Product Overview & Core Advantages
The 311-2ZNR is a single row deep groove ball bearing engineered for radial load applications requiring high reliability and compact design. This shielded bearing features an integral snap ring on its outer ring for simplified axial location within a housing, eliminating the need for complex machining. Pre-lubricated with grease, it offers maintenance-free operation and is built from high-grade chrome steel for extended service life in demanding industrial environments.
311-2ZNR Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning | Advantage |
|---|---|---|
| 2Z | Non-contact shields on both sides | Provides effective protection against contamination while maintaining high-speed capability. |
| NR | Snap ring groove and snap ring fitted on the outer ring | Enables secure axial location, simplifying housing design and reducing assembly time and cost. |
311-2ZNR Bearing Structural Features & Performance Benefits
- Robust Construction: The single row deep groove raceway and stainless steel cage provide stable operation and high radial dynamic load rating of 17,805 lbf.
- Simplified Installation: The integrated snap ring acts as a positive locating feature, preventing creeping and simplifying the bearing housing design.
- Contamination Resistance & Longevity: The 2Z shields protect the chrome steel components from dust and debris. Combined with factory-applied grease lubrication, this ensures maintenance-free operation and a long service life.
- Precision Performance: Manufactured to P0 tolerance class with a standard CN radial clearance, ensuring consistent performance and interchangeability.
311-2ZNR Bearing Typical Application Areas
This bearing is ideally suited for applications where reliable radial load support and easy mounting are critical. Key sectors include:
- Electric Motors and Gearboxes
- Industrial Pumps and Fans
- Agricultural and Construction Machinery
- Material Handling Equipment (e.g., Conveyors)
