QJ 1272 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 1272 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
190 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
360 mm
Bore diameter tolerance
-0.03mm to 0
Outside diameter
650 mm
Outside diameter tolerance
-0.045mm to 0
Width
122 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
6 mm
Distance from side face to load point
505 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
472 mm
Outer Ring Dimensions
Shoulder diameter outer ring
538 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
249750 lbf
Radial static load rating
585000 lbf
Limiting speed
1.5 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 1272 N2MA Bearing Product Overview & Core Advantages
The QJ 1272 N2MA is a high-precision Four Point Contact Ball Bearing designed for demanding industrial applications. This single row bearing excels at simultaneously handling combined radial loads and substantial axial loads from both directions, making it an exceptionally versatile and compact solution. Manufactured to a P6 (ABEC-3) tolerance class, it guarantees high running accuracy and reliability, which is critical for precision machinery and high-performance systems.
QJ 1272 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| N2 | Indicates the bearing has two machined grooves in the outer ring for lubrication and potentially for mounting sealing elements. |
| MA | Signifies that the bearing is supplied lubricated with a specific high-performance grease suitable for the specified temperature range. |
QJ 1272 N2MA Bearing Structural Features & Performance Benefits
- Four Point Contact Design: The unique raceway geometry allows the bearing to support combined loads efficiently. A single bearing can replace a traditional bearing pair, saving space and simplifying design.
- High Load Capacity: With a dynamic load rating of 249,750 lbf and a static load rating of 585,000 lbf, this bearing is engineered for heavy-duty applications and long service life.
- Precision & Rigidity: The P6 tolerance class ensures precise internal geometry, contributing to smooth operation, reduced vibration, and high system rigidity. The optimized shoulder diameters provide secure seating and accurate load transmission.
- Optimized Components: The brass cage ensures reliable guidance of the balls under high-speed and high-load conditions, contributing to stable performance.
- Ready-to-Install: Being pre-lubricated, the bearing is delivered ready for immediate installation, reducing setup time and ensuring optimal initial performance.
QJ 1272 N2MA Bearing Typical Application Areas
This bearing is ideally suited for applications requiring high precision and the ability to handle complex load scenarios. Key industries and machinery include:
- Industrial Robots and Robotic Arms (for rotary joints)
- Wind Turbine pitch and yaw control systems
- Machine Tool rotary tables and indexing heads
- Heavy-Duty Turntables and slewing rings
- Medical Imaging Equipment (e.g., CT scanners)
- Radar and Satellite Communication antennas
