QJ 312 MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 312 MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
2.15 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
130 mm
Outside diameter tolerance
-0.015mm to 0
Width
31 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
2.1 mm
Distance from side face to load point
67 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
77 mm
Outer Ring Dimensions
Shoulder diameter outer ring
106 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
35100 lbf
Radial static load rating
30825 lbf
Limiting speed
9 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 312 MA Bearing Product Overview & Core Advantages
The QJ 312 MA is a metric single row four-point contact ball bearing engineered for high-performance applications requiring exceptional rigidity and precise operation. Its unique four-point contact design enables it to simultaneously withstand combined radial and axial loads from any direction with a single bearing, offering a compact and efficient solution. Manufactured to a P6 (ABEC-3) tolerance class, it guarantees high running accuracy, making it ideal for demanding, high-reliability scenarios where precision is paramount.
QJ 312 MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning |
|---|---|
| QJ 312 | Standard designation for a four-point contact ball bearing with a 60mm bore. |
| MA | Indicates the bearing is pre-lubricated from the factory, ensuring immediate operation and simplifying installation. |
| Open (Seal Type) | No integral seals, allowing for optimal heat dissipation and suitability for applications where external sealing is provided or where re-lubrication is part of the maintenance schedule. |
QJ 312 MA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The four-point contact raceway design provides high rigidity and enables the bearing to handle significant combined loads (radial and axial) efficiently, acting like a pair of angular contact ball bearings. This makes it exceptionally robust for its compact bearing dimensions (60mm x 130mm x 31mm).
- Precision Performance: Built to a P6 tolerance class with a brass cage, this precision bearing ensures smooth, quiet, and accurate rotation, minimizing vibration and run-out in high-speed applications.
- Optimized for Speed: The robust brass cage is designed for stability at high rotational speeds, contributing to the bearing's limiting speed of 9,000 rpm.
- Ready-to-Install: The factory-applied lubrication (MA suffix) means the bearing is prepped for immediate use, reducing setup time and ensuring optimal initial performance.
QJ 312 MA Bearing Typical Application Areas
This bearing is ideally suited for heavy-duty and precision machinery, including:
- Industrial Robotic Arms and Gears
- Machine Tool Turntables and Indexing Tables
- Material Handling Equipment
- Wind Turbine Yaw and Pitch Drives
- Construction Equipment Slewing Rings
