QJ 338 N2MA
Four-Point Contact Bearings Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
QJ 338 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
49 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
400 mm
Outside diameter tolerance
-0.028mm to 0
Width
78 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
5 mm
Distance from side face to load point
207 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
263 mm
Outer Ring Dimensions
Shoulder diameter outer ring
326 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
157950 lbf
Radial static load rating
261000 lbf
Limiting speed
2.8 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
Price:
$ 1147.43
/ each
In Stock
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QJ 338 N2MA Bearing Product Overview & Core Advantages
The QJ 338 N2MA is a Four Point Contact Ball Bearing designed for exceptional performance in demanding applications. This precision bearing is engineered to simultaneously withstand combined radial and axial loads from both directions with a single bearing row, offering a compact and efficient solution. Its high load-carrying capacity and P6 (ABEC-3) tolerance class make it ideal for applications requiring high reliability and rotational accuracy. The bearing comes pre-lubricated for immediate use and features a robust brass cage for stable operation.
QJ 338 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, providing a secure axial location. |
| MA | Signifies that the bearing is filled with a specific high-performance lubricant, ensuring optimal performance from the start and reducing initial maintenance. |
QJ 338 N2MA Bearing Structural Features & Performance Benefits
- High Load Capacity & Rigidity: The unique four point contact design allows the bearing to handle significant combined radial and axial loads efficiently. The optimized raceway and ball geometry contribute to high system rigidity.
- Compact Design: As a single row bearing capable of replacing traditional duplex arrangements, it saves space and simplifies assembly, making it a compact solution for complex machinery.
- Stable High-Speed Operation: The brass cage ensures excellent dimensional stability and low friction at high speeds, contributing to a reliable limiting speed of 2,800 rpm.
- Precision & Reliability: Manufactured to a P6 tolerance class with precise bearing dimensions (190mm bore, 400mm OD), it guarantees consistent performance and long service life in precision applications.
QJ 338 N2MA Bearing Typical Application Areas
This bearing is ideally suited for heavy-duty and precision applications, including:
- Industrial Gearboxes and power transmission systems
- Large Machine Tool Spindles and rotary tables
- Construction and Mining Equipment (e.g., slewing rings)
- Material Handling Systems and turntables
- Wind Turbine Pitch and Yaw Control Systems
