QJ 1284 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 1284 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
315 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
420 mm
Bore diameter tolerance
-0.035mm to 0
Outside diameter
760 mm
Outside diameter tolerance
-0.045mm to 0
Width
150 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
7.5 mm
Distance from side face to load point
590 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
549 mm
Outer Ring Dimensions
Shoulder diameter outer ring
631 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
321750 lbf
Radial static load rating
843750 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
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In Stock
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QJ 1284 N2MA Bearing Product Overview & Core Advantages
The QJ 1284 N2MA is a metric single row four-point contact ball bearing engineered for exceptional performance in demanding applications. This precision bearing is distinguished by its ability to simultaneously support substantial radial loads and axial loads from both directions with a single bearing row, offering a compact and highly efficient design solution. Manufactured to a P6 (ABEC-3) tolerance class, it ensures high running accuracy and reliability. Its robust construction and optimized internal geometry contribute to its high rigidity and long service life, making it ideal for heavy-duty machinery where space and performance are critical.
QJ 1284 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning | Advantage |
|---|---|---|
| N2 | Snap ring groove on the outer ring with two lubrication holes | Facilitates secure axial location and provides convenient points for re-lubrication. |
| MA | Brass cage, window type, guided by the outer ring | Provides high strength and stability, suitable for high-speed operation and heavy loads. |
QJ 1284 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 more complex bearing arrangements and saving space.
- High Load Capacity: With a dynamic load rating of 321,750 lbf and a static load rating of 843,750 lbf, this bearing is built to withstand significant forces in heavy machinery.
- Precision & Rigidity: The P6 tolerance class ensures precise internal clearances and dimensional stability, leading to smooth operation and high rigidity under load.
- Robust Material Construction: Components made from chrome steel and a brass cage offer excellent durability, wear resistance, and performance across the specified temperature range (-30° to 110 °C).
- Integrated Lubrication: The open seal type with lubrication holes (N2) allows for effective lubrication management, crucial for maintaining performance and longevity.
QJ 1284 N2MA Bearing Typical Application Areas
This bearing is designed for heavy-duty industrial applications where high load capacity and compactness are paramount. Key sectors include:
- Industrial Turntables and Slewing Rings
- Wind Turbine Yaw and Pitch Systems
- Construction Machinery (e.g., excavators, cranes)
- Material Handling Equipment
- Large Robotic Arms and Precision Positioning Systems
