QJ 1248 MA/344524
Four-Point Contact Bearings Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
QJ 1248 MA/344524
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
61 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
240 mm
Bore diameter tolerance
-0.022mm to 0
Outside diameter
440 mm
Outside diameter tolerance
-0.033mm to 0
Width
85 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
4 mm
Distance from side face to load point
340 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
316 mm
Outer Ring Dimensions
Shoulder diameter outer ring
364 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
149175 lbf
Radial static load rating
274500 lbf
Limiting speed
2.4 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:
$ 3603.86
/ each
In Stock
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
QJ 1248 MA/344524 Bearing Product Overview & Core Advantages
The QJ 1248 MA/344524 is a Four-Point Contact Ball Bearing engineered for exceptional performance in demanding applications. This metric single row bearing is distinguished by its ability to simultaneously support substantial radial loads and axial loads in both directions. Manufactured to a P6 (ABEC-3) tolerance class, it guarantees high running accuracy and reliability. Its compact design, combined with a high load rating, makes it an ideal solution for applications requiring high rigidity and precise rotational motion.
QJ 1248 MA/344524 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| QJ | Denotes the bearing series as a Four-Point Contact Ball Bearing. |
| 1248 | Specifies the bearing dimensions: 240mm bore, 440mm outside diameter. |
| MA | Indicates special design features for the brass cage and internal geometry. |
| /344524 | Internal manufacturer designation for the specific variant and lubrication. |
QJ 1248 MA/344524 Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: The unique raceway geometry allows the bearing to handle combined loads efficiently, supporting radial loads and bidirectional axial loads with a single bearing, simplifying assembly and saving space.
- High Load Capacity: With a dynamic load rating of 149,175 lbf and a static load rating of 274,500 lbf, this bearing is built for heavy-duty operation and long service life.
- Precision & Rigidity: The P6 tolerance class ensures high dimensional accuracy and consistent performance. The robust chrome steel construction of rings and balls provides high rigidity and resistance to deformation under load.
- Optimized Cage & Lubrication: The brass cage ensures stability and durability at the specified limiting speed of 2,400 rpm. The bearing is pre-lubricated for immediate operation within a wide temperature range of -30°C to 110°C.
QJ 1248 MA/344524 Bearing Typical Application Areas
This bearing is ideally suited for heavy machinery and precision equipment where high load capacity and compact design are critical. Key applications include:
- Industrial Gearboxes
- Large Pumps and Compressors
- Material Handling Equipment
- Construction and Mining Machinery
- Wind Turbine Pitch and Yaw Systems
