QJ 210 MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 210 MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.59 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
50 mm
Bore diameter tolerance
-0.01mm to 0
Outside diameter
90 mm
Outside diameter tolerance
-0.013mm to 0
Width
20 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
1.1 mm
Distance from side face to load point
49 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
59.5 mm
Outer Ring Dimensions
Shoulder diameter outer ring
76.5 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
14738 lbf
Radial static load rating
13725 lbf
Limiting speed
13 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 210 MA Bearing Product Overview & Core Advantages
The QJ 210 MA is a metric single row four point contact ball bearing engineered for applications requiring high precision and the ability to handle combined loads. Its unique four point contact design enables it to support significant radial loads and axial loads in both directions simultaneously, making it an exceptionally compact and versatile solution. Manufactured to a P6 (ABEC-3) tolerance class, this bearing delivers reliable performance in high-speed scenarios, with a limiting speed of 13,000 rpm, and is pre-lubricated for immediate use.
QJ 210 MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| MA | Indicates the bearing is supplied with a brass cage. This cage material offers excellent durability and is suitable for high-speed operation and demanding applications. |
| Open (Seal Type) | The bearing features an open (non-shielded/non-sealed) design. This allows for optimal heat dissipation and is intended for applications where the operating environment is clean or where a specific, external sealing solution is used. |
QJ 210 MA Bearing Structural Features & Performance Benefits
- Four Point Contact Design: The core structural feature that allows the bearing to accommodate combined radial and bidirectional axial loads with a single bearing row, saving space and simplifying assembly.
- High Precision & Rigidity: Built to P6 tolerance with precisely ground raceways and components, ensuring smooth operation, minimal runout, and high system rigidity.
- High-Speed Capability: The combination of the brass cage (MA) and optimized internal geometry contributes to stable performance at high rotational speeds up to 13,000 rpm.
- Robust Material Construction: Components are manufactured from chrome steel for the rings and balls, and brass for the cage, providing high load capacity, wear resistance, and long service life.
- Pre-Lubricated: The bearing comes lubricated from the factory, ensuring immediate startup protection and reducing initial maintenance requirements.
QJ 210 MA Bearing Typical Application Areas
This bearing is ideally suited for precision machinery and equipment where compactness and the ability to handle complex loads are critical. Key applications include:
- Robotics and automation arms (for joint and rotary axis applications)
- Machine Tool rotary tables and indexing heads
- Precision Gearboxes
- Aerospace control mechanisms and actuators
- Medical Equipment requiring high-speed and precise rotation
