QJ 344 N2MA
Four-Point Contact Bearings Ball Bearings
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Basic Information
Main Dimensions
Inner Ring Dimensions
Outer Ring Dimensions
Performance
Materials
Environment & Compliance
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QJ 344 N2MA Bearing Product Overview & Core Advantages
The QJ 344 N2MA is a Four Point Contact Ball Bearing designed for exceptional performance in demanding applications. This single row bearing is engineered to simultaneously withstand combined radial and axial loads from both directions, making it an ideal, compact solution. Manufactured to a P6 (ABEC-3) tolerance class, it delivers high precision and reliability. Its robust construction and optimized internal geometry ensure high rigidity and stable operation under significant loads.
QJ 344 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| QJ 344 | Denotes the bearing series and size (220mm bore, 460mm OD). |
| N2 | Indicates the bearing has two machined windows in the outer ring, often for sensor mounting or lubrication access. |
| MA | Signifies that the bearing is pre-lubricated with a specific, high-performance grease suitable for the stated temperature range. |
QJ 344 N2MA Bearing Structural Features & Performance Benefits
Four Point Contact Design: The unique raceway geometry allows the bearing to handle combined radial and axial loads efficiently in a single, compact unit, simplifying assembly and saving space.
High Load Capacity: With a dynamic load rating of 175,500 lbf and a static load rating of 315,000 lbf, this bearing is built for heavy-duty applications requiring long service life.
Precision & Rigidity: The P6 tolerance class ensures high running accuracy, while the solid construction and large shoulder diameters contribute to a high rigidity system.
Optimized Components: The brass cage provides excellent durability and guidance at the limiting speed of 2,400 rpm. The pre-lubrication (MA) ensures immediate and reliable operation upon installation.
QJ 344 N2MA Bearing Typical Application Areas
This bearing is ideally suited for heavy machinery and precision equipment where high load capacity and compact design are critical. Key applications include:
- Industrial Gearboxes
- Large Pumps and Compressors
- Construction and Mining Equipment
- Material Handling Systems
- Wind Turbine Main Shafts
