QJ 238 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 238 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
23.3 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
190 mm
Bore diameter tolerance
-0.022mm to 0
Outside diameter
340 mm
Outside diameter tolerance
-0.028mm to 0
Width
55 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
4 mm
Distance from side face to load point
185 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
244 mm
Outer Ring Dimensions
Shoulder diameter outer ring
285 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
114750 lbf
Radial static load rating
191250 lbf
Limiting speed
3.2 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
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In Stock
Price available upon request.
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QJ 238 N2MA Bearing Product Overview & Core Advantages
The QJ 238 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 solution for compact designs requiring high load capacity. Its precision P6 (ABEC-3) tolerance class ensures reliable operation and high rotational accuracy, while the brass cage contributes to stable performance at the specified limiting speed.
QJ 238 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| N2 | Indicates the bearing has two lubrication grooves and three lubrication holes in the outer ring. |
| MA | Signifies that the bearing is supplied with a specific, high-performance lubrication suitable for the operating temperature range. |
QJ 238 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 Load Capacity: With a radial dynamic load rating of 114,750 lbf and a static load rating of 191,250 lbf, this bearing is built for heavy-duty applications and long service life.
- Precision & Stability: Manufactured to a P6 tolerance class and featuring a robust brass cage, the bearing ensures smooth operation, reduced vibration, and reliable performance at high speeds.
- Optimized Lubrication: The N2 suffix denotes an integrated lubrication system, facilitating efficient re-lubrication to maintain performance and extend bearing life within the specified temperature range.
QJ 238 N2MA Bearing Typical Application Areas
This bearing is ideally suited for heavy machinery and precision equipment where high load capacity and compactness are critical. Key applications include:
- Industrial Gearboxes
- Large Pumps and Compressors
- Construction and Mining Equipment
- Material Handling Systems
- Wind Turbine Pitch and Yaw Systems
