QJ 307 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 307 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.57 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
35 mm
Bore diameter tolerance
-0.01mm to 0
Outside diameter
80 mm
Outside diameter tolerance
-0.011mm to 0
Width
21 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
1.5 mm
Distance from side face to load point
40 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
46.2 mm
Outer Ring Dimensions
Shoulder diameter outer ring
64.3 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
14400 lbf
Radial static load rating
11475 lbf
Limiting speed
15 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 307 N2MA Bearing Product Overview & Core Advantages
The QJ 307 N2MA is a four-point contact ball bearing designed for exceptional performance in demanding applications. This single-row bearing is engineered to simultaneously withstand combined radial and axial loads from both directions, making it an ideal compact solution. Manufactured to a P6 (ABEC-3) tolerance class, it delivers high running accuracy and reliability. Its pre-lubricated design ensures immediate operation and long service life, positioning it as a high-precision and high-rigidity component for critical machinery.
QJ 307 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| N2 | Indicates the bearing has two machined circumferential grooves and three lubrication holes in the outer ring for effective re-lubrication. |
| MA | Specifies that the bearing is filled with a specific high-temperature, high-speed lubricating grease suitable for the operating temperature range. |
QJ 307 N2MA Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: The unique raceway geometry allows the bearing to handle combined radial and axial loads efficiently in a compact single-row format, saving space and weight.
- High Rigidity and Load Capacity: The robust construction using Chrome Steel for rings and balls provides high dynamic and static load ratings (14,400 lbf / 11,475 lbf), ensuring stable operation under significant stress.
- Precision and Speed: Built to P6 tolerance and featuring a durable brass cage, the bearing maintains precision at a limiting speed of 15,000 rpm, making it suitable for high-speed applications.
- Enhanced Service Life: The N2 re-lubrication feature and pre-filled MA grease extend service intervals and enhance reliability across the specified temperature range.
QJ 307 N2MA Bearing Typical Application Areas
This bearing is ideally suited for applications requiring high precision and the ability to handle complex loads. Key industries and equipment include:
- Machine Tool Spindles
- Industrial Gearboxes
- Pumps and Compressors
- Precision Robotic Arms
- Aerospace Actuation Systems
