QJ 1268 MA/344524
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 1268 MA/344524
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
165 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
340 mm
Bore diameter tolerance
-0.03mm to 0
Outside diameter
620 mm
Outside diameter tolerance
-0.038mm to 0
Width
118 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
6 mm
Distance from side face to load point
480 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
447 mm
Outer Ring Dimensions
Shoulder diameter outer ring
513 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
238500 lbf
Radial static load rating
551250 lbf
Limiting speed
1.6 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
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QJ 1268 MA/344524 Bearing Product Overview & Core Advantages
The QJ 1268 MA/344524 is a metric single row four-point contact ball bearing engineered for exceptional performance in demanding applications. This precision bearing is distinguished by its ability to simultaneously support substantial combined loads, including radial loads and bidirectional axial loads, within a single, compact unit. Manufactured to a P6 (ABEC-3) tolerance class, it guarantees high running accuracy and reliability. Its robust construction and optimized bearing dimensions (340 mm bore, 620 mm outside diameter) make it an ideal solution for heavy-duty machinery requiring high rigidity and precise operation.
QJ 1268 MA/344524 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| QJ | Four-Point Contact Ball Bearing | Defines the bearing type, capable of handling combined radial and axial loads from both directions. |
| 1268 MA | Standardized size designation | Specifies the bore diameter (340 mm), outside diameter (620 mm), and width (118 mm). |
| /344524 | Internal design and cage specification | Indicates specific internal geometry and the use of a brass cage for strength and stability. |
QJ 1268 MA/344524 Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: The unique raceway geometry allows a single bearing to accommodate significant combined radial and axial loads from any direction, simplifying bearing arrangements and saving space.
- High Rigidity & Load Capacity: The solid construction and large bearing dimensions contribute to high rigidity. With a radial dynamic load rating of 238,500 lbf and a static load rating of 551,250 lbf, it is built for heavy-duty applications.
- Precision & Stability: Manufactured to P6 tolerance and featuring a brass cage, this bearing ensures smooth, quiet, and stable operation at its limiting speed of 1,600 rpm.
- Durability & Compliance: Components made from chrome steel offer excellent wear resistance and durability. The bearing is supplied lubricated and is compliant with ROHS and REACH regulations.
QJ 1268 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 sectors include:
- Industrial Gearboxes and large power transmission systems.
- Heavy-Duty Turntables and slewing rings in construction and mining equipment.
- Large Machine Tool Components, such as rotary tables and indexing heads.
- Wind Turbine Yaw and Pitch Systems.
- Material Handling Equipment including cranes and robotic arms.
