QJ 1240 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 1240 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
32.5 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
200 mm
Bore diameter tolerance
-0.022mm to 0
Outside diameter
360 mm
Outside diameter tolerance
-0.028mm to 0
Width
70 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
4 mm
Distance from side face to load point
280 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
260 mm
Outer Ring Dimensions
Shoulder diameter outer ring
300 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
117000 lbf
Radial static load rating
194625 lbf
Limiting speed
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
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In Stock
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QJ 1240 N2MA Bearing Product Overview & Core Advantages
The QJ 1240 N2MA is a metric single row four-point contact ball bearing engineered for exceptional performance in demanding applications. This precision bearing is specifically designed to simultaneously withstand combined loads, including radial loads and axial loads from both directions, within a single, compact unit. Its optimized internal geometry and high-grade materials deliver high rigidity and reliable operation, making it an ideal solution for high-precision machinery requiring robust support and long service life.
QJ 1240 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| N2 | Indicates two machined circumferential grooves in the outer ring for lubrication and potentially for mounting sealing rings. |
| MA | Signifies that the bearing is filled with a specific, high-performance lubricating grease, ensuring optimal performance from the start. |
QJ 1240 N2MA Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: The unique raceway geometry allows the bearing to handle combined radial and bidirectional axial loads efficiently, replacing the need for complex bearing arrangements and saving space.
- High Rigidity and Load Capacity: The single-row design with a large bore diameter of 200 mm and a robust brass cage provides excellent structural integrity, supporting high dynamic and static load ratings (117,000 lbf and 194,625 lbf respectively).
- Precision Performance: Manufactured to a P6 (ABEC-3) tolerance class, this bearing ensures high running accuracy, reduced vibration, and consistent performance in precision applications.
- Ready-to-Install & Corrosion Resistant: The bearing is pre-lubricated and features an open design, facilitating easy re-lubrication. The chrome steel construction offers good resistance to wear and corrosion.
QJ 1240 N2MA Bearing Typical Application Areas
This bearing is well-suited for heavy-duty industrial applications where high load capacity and compact design are critical. Common uses include:
- Industrial Turntables and Slewing Rings
- Wind Turbine Pitch and Yaw Systems
- Construction Machinery (e.g., excavators, cranes)
- Robotics and Automated Handling Systems
- Indexing Tables in Machine Tools
