QJ 209 MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 209 MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.52 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.01mm to 0
Outside diameter
85 mm
Outside diameter tolerance
-0.013mm to 0
Width
19 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
1.1 mm
Distance from side face to load point
46 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
54.5 mm
Outer Ring Dimensions
Shoulder diameter outer ring
72 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
14175 lbf
Radial static load rating
12600 lbf
Limiting speed
14 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 209 MA Bearing Product Overview & Core Advantages
The QJ 209 MA is a metric single row four-point contact ball bearing engineered for applications requiring exceptional precision and load handling capabilities. This bearing is specifically designed to simultaneously accommodate combined radial and axial loads from both directions, making it an ideal solution for compact, high-rigidity arrangements. Manufactured to a P6 (ABEC-3) tolerance class, it ensures high running accuracy and reliable performance in demanding operational environments.
QJ 209 MA Bearing Model Code Explained, Specifications & Naming Convention
The QJ 209 MA model designation provides specific technical information:
- QJ 209: Standard designation for a four-point contact ball bearing with a 45mm bore.
- M: Indicates the bearing is supplied with a brass cage.
- A: Signifies that the bearing is lubricated from the factory.
QJ 209 MA Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: The optimized raceway geometry allows the bearing to handle combined radial and bidirectional axial loads efficiently, simplifying bearing arrangements and saving space.
- High Rigidity and Precision: Built to a P6 tolerance class with precise dimensional control, this bearing provides stable, accurate rotation essential for high-performance machinery.
- Robust Construction: The use of chrome steel for rings and balls, combined with a durable brass cage, ensures high dynamic capacity and reliable operation under significant loads.
- Optimized for Performance: The design features a specific distance from side face to load point (46 mm), contributing to stable moment load support.
QJ 209 MA Bearing Typical Application Areas
This bearing is widely used in applications requiring high precision and the ability to support complex load conditions. Key industries and equipment include:
- Industrial Robotics: For robot arm joints and rotary units.
- Machine Tool Spindles: Especially in indexing tables and rotary bearings.
- Precision Gearboxes and Turntables.
- Aerospace Actuation Systems and other high-reliability machinery.
