311NR
300 Series Snap Ring Bearings
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Part No.
Part No.
311NR
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
1.5 kg
Tolerance class
ABEC 1 | ISO P0
Seal type
Open
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)
Performance
Temperature range
-30°to 120 °C
Radial dynamic load rating
17805 lbf
Radial static load rating
15062 lbf
Limiting speed
6.3 X 1000 rpm
Lubrication
None
Radial internal clearance
CN
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Chrome Steel
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 29.6
/ each
In Stock
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311NR Bearing Product Overview & Core Advantages
The 311NR single row deep groove ball bearing is a precision bearing designed for robust radial load applications. Its key advantage lies in the integrated snap ring on the outer ring, which simplifies axial positioning and reduces housing design complexity and costs. Manufactured to ABEC 1 (ISO P0) tolerance standards with CN radial internal clearance, it delivers reliable performance and high operational consistency. The open design and high-quality chrome steel construction ensure excellent durability for a wide range of industrial uses.
311NR Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| 311 | Standard bore diameter code, indicating a 55 mm bore. |
| NR | Signifies an outer ring with a snap ring groove and a fitted snap ring. This feature acts as a locating shoulder, facilitating secure axial positioning within the housing. |
311NR Bearing Structural Features & Performance Benefits
- Snap Ring Locating Feature: The outer ring is equipped with a snap ring, which provides a positive stop for axial location. This eliminates the need for complex shoulder machining in the housing, leading to reduced assembly time and cost.
- High Load Capacity: The single row deep groove raceway and high-grade chrome steel construction provide a high radial dynamic load rating of 17,805 lbf and a radial static load rating of 15,062 lbf, ensuring long service life under demanding conditions.
- Precision Performance: Manufactured to ABEC 1 (ISO P0) tolerance class, this bearing offers consistent running accuracy and low vibration, making it suitable for general precision applications.
- Versatile Operating Range: With a limiting speed of 6,300 rpm and a wide operating temperature range from -30°C to 120°C, it is adaptable to various operational environments.
- Open Design: The unsealed, open structure allows for easy re-lubrication and is ideal for applications where the operating environment is controlled or where specific lubrication regimes are required.
311NR Bearing Typical Application Areas
- Electric Motors and Generators
- Gearboxes and Transmission Systems
- Industrial Pumps and Compressors
- Material Handling Equipment (Conveyors, Pulleys)
- Agricultural Machinery
- General Industrial Machinery requiring simplified housing design
