QJ 240 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 240 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
28.5 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
200 mm
Bore diameter tolerance
-0.022mm to 0
Outside diameter
360 mm
Outside diameter tolerance
-0.028mm to 0
Width
58 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
4 mm
Distance from side face to load point
196 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
258 mm
Outer Ring Dimensions
Shoulder diameter outer ring
302 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
121500 lbf
Radial static load rating
205875 lbf
Limiting speed
3 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 240 N2MA Bearing Product Overview & Core Advantages
The QJ 240 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 loads and substantial axial loads from both directions, making it an ideal solution for compact, high-rigidity designs. Manufactured to a P6 (ABEC-3) tolerance class, it delivers the precision required for high-reliability machinery. Its optimized internal geometry and brass cage contribute to smooth operation and extended service life.
QJ 240 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| N2 | Indicates the bearing has two machined grooves in the outer ring for locating snap rings. |
| MA | Signifies that the bearing is pre-lubricated with a specific high-performance grease suitable for the specified temperature range. |
QJ 240 N2MA Bearing Structural Features & Performance Benefits
- High Load Capacity & Rigidity: The four-point contact design allows the bearing to handle significant combined loads (radial and bidirectional axial) with high system rigidity, thanks to its optimized raceway geometry and a large load point distance of 196 mm.
- Precision & Smooth Operation: Built to a P6 tolerance class and featuring a durable brass cage, this bearing ensures precise rotation, low vibration, and low noise, even at the limiting speed of 3000 rpm.
- Simplified Assembly & Maintenance: The N2 suffix grooves facilitate secure axial location within the housing using snap rings, simplifying design and assembly. The pre-lubrication (MA) provides long-term, maintenance-free operation within the standard temperature range.
- Robust Construction: Manufactured from chrome steel for both rings and balls, the bearing offers high durability and resistance to wear.
QJ 240 N2MA Bearing Typical Application Areas
This bearing is ideally suited for applications requiring high rigidity and the ability to support complex load scenarios. Key industries and equipment include:
- Industrial Robotics: Used in robot arm joints and rotary units.
- Machine Tools: Ideal for rotary tables, indexing heads, and slewing rings.
- Material Handling: Found in turntables and swivel mechanisms for cranes and excavators.
- Wind Turbines: Applicable in yaw and pitch control systems.
- Medical & Precision Equipment: Used in high-precision rotary stages and scanning devices.
