QJ 1244 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 1244 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
45.5 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
220 mm
Bore diameter tolerance
-0.022mm to 0
Outside diameter
400 mm
Outside diameter tolerance
-0.028mm to 0
Width
78 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
4 mm
Distance from side face to load point
310 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
287 mm
Outer Ring Dimensions
Shoulder diameter outer ring
333 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
133200 lbf
Radial static load rating
229500 lbf
Limiting speed
2.6 X 1000 rpm
Lubrication
Lubricated
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Brass
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
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In Stock
Price available upon request.
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QJ 1244 N2MA Bearing Product Overview & Core Advantages
The QJ 1244 N2MA is a Four Point Contact Ball Bearing engineered for exceptional performance in demanding applications. This single row bearing is designed to simultaneously withstand combined loads, including radial loads and axial loads in both directions, making it an exceptionally versatile and compact solution. Manufactured to a P6 (ABEC-3) tolerance class, it ensures high running accuracy and reliability, ideal for precision machinery requiring robust support and long service life.
QJ 1244 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| QJ 1244 | Indicates the basic bearing type: a Four Point Contact Ball Bearing with a 220mm bore and 400mm outside diameter. |
| N2 | Specifies the cage type, which in this case is a machined brass cage, offering excellent strength and guidance at high speeds. |
| MA | Denotes that the bearing is lubricated and ready for operation upon installation. |
QJ 1244 N2MA Bearing Structural Features & Performance Benefits
- Four Point Contact Design: The unique raceway geometry allows the bearing to handle combined radial and axial loads from both directions with a single bearing row, resulting in a compact and space-saving design.
- High Load Capacity: With a dynamic load rating of 133,200 lbf and a static load rating of 229,500 lbf, this bearing is built for heavy-duty applications and offers a long operational lifespan.
- Precision & High-Speed Capability: The P6 tolerance class ensures precise running, while the robust machined brass cage (N2) provides stability and allows for a limiting speed of 2,600 rpm.
- Durable Construction: Components made from chrome steel for rings and balls provide high hardness and wear resistance, ensuring reliable performance across a temperature range of -30°C to 110°C.
QJ 1244 N2MA Bearing Typical Application Areas
This bearing is ideally suited for applications requiring high rigidity and the ability to support complex load combinations. Key industries and machinery include:
- Industrial Gearboxes
- Large Pumps and Compressors
- Material Handling Equipment
- Construction and Mining Machinery
- Wind Turbine Main Shafts
