QJ 1280 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 1280 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
265 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
400 mm
Bore diameter tolerance
-0.03mm to 0
Outside diameter
720 mm
Outside diameter tolerance
-0.045mm to 0
Width
140 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
6 mm
Distance from side face to load point
560 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
522 mm
Outer Ring Dimensions
Shoulder diameter outer ring
598 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
292500 lbf
Radial static load rating
731250 lbf
Limiting speed
1.3 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
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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QJ 1280 N2MA Bearing Product Overview & Core Advantages
The QJ 1280 N2MA is a high-precision four-point contact ball bearing designed for demanding industrial applications. This metric single row bearing excels in its ability to simultaneously withstand combined radial and axial loads from both directions. Engineered with a P6 (ABEC-3) tolerance class, it delivers exceptional rotational accuracy and reliability. Its compact design, featuring a substantial 400 mm bore and optimized load point geometry, makes it an ideal solution for applications requiring high rigidity and precise performance in a space-efficient package.
QJ 1280 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| N2 | Indicates the specific internal design and contact angle optimized for four-point contact and high axial load capacity. |
| MA | Signifies that the bearing is supplied lubricated, ensuring it is ready for immediate installation and initial operation. |
QJ 1280 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 both directions, simplifying bearing arrangements and reducing the need for complex multi-bearing setups.
- High Load Capacity: With a dynamic load rating of 292,500 lbf and a static load rating of 731,250 lbf, this bearing is built for heavy-duty applications and long service life.
- Precision & Rigidity: Manufactured to a P6 tolerance class and featuring a brass cage for stability, it ensures smooth operation, minimal vibration, and high system rigidity.
- Optimized Geometry: The specified shoulder diameters and a load point distance of 560 mm contribute to stable mounting and effective force transmission.
- Material Quality: Constructed from chrome steel for both rings and balls, providing high hardness, wear resistance, and durability.
QJ 1280 N2MA Bearing Typical Application Areas
This bearing is ideally suited for heavy machinery and precision equipment, including:
- Industrial Turntables and Slewing Rings
- Large Gearboxes and Drivetrains
- Construction Machinery (e.g., excavators, cranes)
- Wind Turbine Yaw and Pitch Systems
- Material Handling Equipment
