QJ 1288 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 1288 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
350 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
440 mm
Bore diameter tolerance
-0.035mm to 0
Outside diameter
790 mm
Outside diameter tolerance
-0.045mm to 0
Width
155 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
7.5 mm
Distance from side face to load point
615 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
574 mm
Outer Ring Dimensions
Shoulder diameter outer ring
656 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
315000 lbf
Radial static load rating
843750 lbf
Limiting speed
1.2 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 1288 N2MA Bearing Product Overview & Core Advantages
The QJ 1288 N2MA is a four-point contact ball bearing designed for exceptional performance in demanding applications. This single-row bearing features an open design and is engineered to simultaneously support high radial loads and axial loads from both directions, making it an ideal solution for compact arrangements requiring high load capacity and precision. Manufactured to a P6 (ABEC-3) tolerance class, it ensures reliable operation and long service life in heavy-duty industrial environments.
QJ 1288 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| N2 | Indicates the specific internal design and contact angle optimized for four-point contact. |
| MA | Signifies that the bearing is supplied with a specific, high-performance lubricant suitable for the specified operating temperature range. |
QJ 1288 N2MA Bearing Structural Features & Performance Benefits
- High Load Capacity: The four-point contact design enables the bearing to handle significant combined radial and axial loads in both directions, eliminating the need for complex bearing arrangements.
- Compact & Space-Saving: As a single-row bearing, it provides high load capacity within a minimal axial space, contributing to more compact machinery designs.
- Precision & Rigidity: Manufactured to P6 tolerance with a brass cage, the bearing ensures smooth operation, high running accuracy, and stable performance under load.
- Durability & Reliability: Components made from chrome steel offer high hardness and fatigue resistance, while the pre-lubrication ensures immediate readiness and protection during initial operation.
QJ 1288 N2MA Bearing Typical Application Areas
This bearing is ideally suited for heavy-duty applications requiring high load capacity and compact design, including:
- Industrial Turntables and Slewing Rings
- Large-Diameter Gearboxes and Drives
- Construction Machinery (e.g., excavators, cranes)
- Wind Turbine Yaw and Pitch Systems
- Material Handling Equipment
