QJ 1256 N2MA
Four-Point Contact Bearings Ball Bearings
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Basic Information
Main Dimensions
Inner Ring Dimensions
Outer Ring Dimensions
Performance
Materials
Environment & Compliance
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QJ 1256 N2MA Bearing Product Overview & Core Advantages
The QJ 1256 N2MA is a high-precision Four Point Contact Ball Bearing engineered for demanding applications requiring exceptional rigidity and load capacity. This metric single row bearing is distinguished by its ability to simultaneously support substantial combined loads—including radial loads and axial loads in both directions—within a compact cross-section. Manufactured to a P6 (ABEC-3) tolerance class, it delivers the high running accuracy and reliability essential for precision machinery. Its pre-lubricated and open design ensures immediate operational readiness and facilitates maintenance planning.
QJ 1256 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning | Significance |
|---|---|---|
| QJ 1256 | Basic Bearing Designation | Identifies the bearing as a four-point contact ball bearing with a 280mm bore. |
| N2 | Snap Ring Groove | Indicates the outer ring features a snap ring groove, simplifying axial location and housing design. |
| MA | Brass Cage & Lubrication | Denotes a machined brass cage for high-speed stability and the bearing is supplied lubricated for immediate use. |
QJ 1256 N2MA Bearing Structural Features & Performance Benefits
Four-Point Contact Design: The core structural feature enables this bearing to handle combined radial and axial loads from both directions with a single bearing row, offering a space-saving solution compared to traditional bearing pairs.
High Rigidity and Load Capacity: With a radial dynamic load rating of 163,800 lbf and a static load rating of 328,500 lbf, the bearing provides robust support for heavy loads and moments, ensuring minimal deflection under stress.
Optimized for Precision: The machined brass cage (MA) ensures superior guidance and stability at the limiting speed of 2,000 rpm, while the P6 tolerance class guarantees precise running accuracy for smooth operation.
Simplified Installation: The inclusion of a snap ring groove (N2) on the outer ring allows for secure axial positioning, reducing assembly complexity and cost.
QJ 1256 N2MA Bearing Typical Application Areas
The QJ 1256 N2MA is ideally suited for heavy-duty industrial applications where high load capacity and compact design are paramount. Key sectors include:
- Industrial Gearboxes and power transmission systems
- Large-Diameter Slewing Rings for construction and material handling equipment
- Precision Turntables and indexing tables in automation
- Wind Turbine Yaw and Pitch Drives
- Heavy-Duty Machine Tools and spindle supports
