QJ 211 MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 211 MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.77 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
55 mm
Bore diameter tolerance
-0.012mm to 0
Outside diameter
100 mm
Outside diameter tolerance
-0.013mm to 0
Width
21 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
1.5 mm
Distance from side face to load point
54 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
66 mm
Outer Ring Dimensions
Shoulder diameter outer ring
84.7 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
19125 lbf
Radial static load rating
18675 lbf
Limiting speed
11 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
In Stock
Price available upon request.
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QJ 211 MA Bearing Product Overview & Core Advantages
The QJ 211 MA is a metric single row four-point contact ball bearing engineered for high-precision applications requiring exceptional rigidity and load capacity. Its unique four-point contact design enables it to simultaneously support substantial radial loads and axial loads from both directions with a single bearing row, offering a compact and efficient solution. Manufactured to a P6 (ABEC-3) tolerance class, it delivers the running accuracy essential for demanding machinery, ensuring high reliability and performance in precision bearing applications.
QJ 211 MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| MA | Indicates the bearing is pre-lubricated with a specific high-performance grease. |
| Open | Specifies an unsealed, open bearing design, suitable for systems with external lubrication. |
QJ 211 MA Bearing Structural Features & Performance Benefits
- High Rigidity & Compact Design: The single row four-point contact geometry provides high rigidity comparable to a duplex pair, but in a more compact cross-section, saving space and weight.
- Superior Load Capacity: Engineered for combined loads, this bearing efficiently handles radial loads and bidirectional axial loads, simplifying bearing arrangements and reducing component count.
- Precision & Speed: The brass cage ensures stable operation at high speeds, contributing to the bearing's limiting speed of 11,000 rpm. The P6 tolerance class guarantees precise running accuracy for smooth, low-vibration operation.
- Ready-to-Install: The pre-lubricated (MA) condition allows for immediate installation and initial operation, reducing setup time and ensuring proper initial lubrication.
QJ 211 MA Bearing Typical Application Areas
This bearing is ideally suited for applications demanding high precision and robust load support, including:
- Machine Tool Spindles
- Industrial Robots and Manipulators
- Precision Gearboxes
- Pumps and Compressors
- Aerospace Actuation Systems
