QJ 212 MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 212 MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
0.99 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
60 mm
Bore diameter tolerance
-0.012mm to 0
Outside diameter
110 mm
Outside diameter tolerance
-0.013mm to 0
Width
22 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
1.5 mm
Distance from side face to load point
60 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
72 mm
Outer Ring Dimensions
Shoulder diameter outer ring
93 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
21712 lbf
Radial static load rating
20925 lbf
Limiting speed
10 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 212 MA Bearing Product Overview & Core Advantages
The QJ 212 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 allows it to support significant radial loads and axial loads from both directions simultaneously, making it an exceptionally compact and versatile solution. Manufactured to a P6 (ABEC-3) tolerance class, this bearing delivers the high running accuracy and reliability essential for demanding industrial machinery.
QJ 212 MA Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning | Benefit |
|---|---|---|
| QJ 212 | Standard designation for a four-point contact ball bearing with a 60mm bore. | Defines the core bearing type and bearing dimensions. |
| M | Indicates the bearing is supplied with brass cage. | Provides high strength and excellent guidance for high-speed performance. |
| A | Specifies a contact angle of 30°. | Optimized for carrying substantial axial loads. |
QJ 212 MA Bearing Structural Features & Performance Benefits
- Four-Point Contact & High Rigidity: The raceway geometry creates four points of contact between the balls and raceways under load. This design provides high rigidity and enables the bearing to withstand combined radial and axial loads in a single, compact unit, simplifying assembly and saving space.
- Superior Load Capacity: With a dynamic load rating of 21,712 lbf and a static load rating of 20,925 lbf, this bearing is built for durability and long service life under significant stress.
- Precision & Speed: The P6 tolerance class ensures smooth, quiet, and precise operation. The machined brass cage contributes to stable operation at the specified limiting speed of 10,000 rpm.
- Ready-to-Use: The bearing comes pre-lubricated and is open on both sides, allowing for easy integration and initial operation without immediate maintenance.
QJ 212 MA Bearing Typical Application Areas
The QJ 212 MA is ideally suited for a wide range of precision industrial applications, including:
- Robotics (e.g., robotic arms and joints)
- Machine Tool Components (e.g., rotary tables, indexing heads)
- Aerospace Actuation Systems
- Medical and Semiconductor Equipment
- Radar and Antenna Positioning Systems
