QJ 252 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 252 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
68 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
260 mm
Bore diameter tolerance
-0.025mm to 0
Outside diameter
480 mm
Outside diameter tolerance
-0.033mm to 0
Width
80 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
5 mm
Distance from side face to load point
259 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
342 mm
Outer Ring Dimensions
Shoulder diameter outer ring
397 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
163800 lbf
Radial static load rating
321750 lbf
Limiting speed
2.2 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 252 N2MA Bearing Product Overview & Core Advantages
The QJ 252 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 loads, including radial loads and axial loads in both directions, making it an extremely compact and versatile solution. Manufactured to a P6 (ABEC-3) tolerance class, it delivers high running accuracy and reliability. Its robust construction ensures high rigidity and a long service life, ideal for precision machinery requiring dependable performance.
QJ 252 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| N2 | Indicates two circular grooves on the outer ring for lubrication. The bearing is supplied lubricated from the factory. |
| MA | Specifies a brass cage, which provides excellent strength and is suitable for high-speed applications and demanding operating conditions. |
QJ 252 N2MA Bearing Structural Features & Performance Benefits
- Four Point Contact Design: The unique raceway geometry allows the bearing to handle combined radial and axial loads from both directions with a single bearing row, offering a compact design that saves space and weight.
- High Load Capacity: With a dynamic load rating of 163,800 lbf and a static load rating of 321,750 lbf, this bearing is built for heavy-duty applications and offers a long operational lifespan.
- Precision & Rigidity: Manufactured to P6 tolerance and featuring a brass cage (MA), the bearing ensures high running accuracy, dimensional stability, and smooth operation at the specified limiting speed.
- Robust Material Construction: Made from chrome steel for both rings and balls, the bearing provides high hardness, wear resistance, and durability across a wide temperature range from -30°C to 110°C.
QJ 252 N2MA Bearing Typical Application Areas
This bearing is ideally suited for applications requiring high precision and the ability to support complex load combinations. Key industries and machinery include:
- Industrial Robots (e.g., robotic arms and rotary joints)
- Wind Turbines (yaw and pitch control systems)
- Machine Tools (rotary tables and indexing heads)
- Material Handling Equipment (slewing rings for cranes and excavators)
- Aerospace Actuation Systems
