QJ 1056 N2MA/C4
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 1056 N2MA/C4
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
33.5 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
280 mm
Bore diameter tolerance
-0.025mm to 0
Outside diameter
420 mm
Outside diameter tolerance
-0.033mm to 0
Width
65 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
4 mm
Distance from side face to load point
245 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
328 mm
Outer Ring Dimensions
Shoulder diameter outer ring
372 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
131625 lbf
Radial static load rating
256500 lbf
Limiting speed
2.4 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
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QJ 1056 N2MA/C4 Bearing Product Overview & Core Advantages
The QJ 1056 N2MA/C4 is a metric four-point contact ball bearing engineered for exceptional performance in demanding applications. This single-row bearing is designed to simultaneously withstand combined radial and axial loads from both directions, making it an ideal solution for compact, high-rigidity designs. Manufactured to a P6 (ABEC-3) tolerance class, it ensures high running accuracy and reliability. Its optimized internal geometry and brass cage contribute to stable operation at its specified limiting speed, while its robust construction supports high dynamic and static load ratings.
QJ 1056 N2MA/C4 Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| QJ 1056 | Denotes the basic bearing series with a 280 mm bore diameter. |
| N2 | Indicates two integral locating snap rings (circumferential grooves) on the outer ring for simplified axial location in the housing. |
| MA | Specifies a brass cage (machined window-type). |
| C4 | Indicates a radial internal clearance greater than the Normal (CN) group, suitable for applications with significant thermal gradients or interference fits. |
QJ 1056 N2MA/C4 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 in a single, compact unit, reducing the need for complex bearing arrangements.
- High Load Capacity: With a dynamic load rating of 131,625 lbf and a static load rating of 256,500 lbf, this bearing is built for heavy-duty applications requiring long service life under significant stress.
- Precision & Rigidity: Manufactured to P6 tolerance and featuring a robust brass cage, the bearing provides high running accuracy, dimensional stability, and smooth operation at the specified limiting speed of 2,400 rpm.
- Simplified Installation: The outer ring with snap ring grooves (N2) facilitates secure axial positioning within the housing, simplifying assembly and reducing overall design complexity.
- Material & Compliance: Constructed from chrome steel for rings and balls, the bearing offers high durability and wear resistance. It is compliant with ROHS and REACH environmental directives.
QJ 1056 N2MA/C4 Bearing Typical Application Areas
- Industrial Gearboxes and heavy-duty power transmission systems.
- Large Turntables and slewing rings in construction, material handling, and wind turbine yaw systems.
- Machine Tools requiring high rigidity and precision in indexing tables and rotary assemblies.
- Pulp & Paper Machinery and other heavy industrial equipment with high moment load requirements.
