QJ 313 MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 313 MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
2.7 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
65 mm
Bore diameter tolerance
-0.012mm to 0
Outside diameter
140 mm
Outside diameter tolerance
-0.015mm to 0
Width
33 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
2.1 mm
Distance from side face to load point
72 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
82.5 mm
Outer Ring Dimensions
Shoulder diameter outer ring
115 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
39600 lbf
Radial static load rating
35100 lbf
Limiting speed
8.5 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 313 MA Bearing Product Overview & Core Advantages
The QJ 313 MA is a metric single row four-point contact ball bearing engineered for applications requiring high precision and exceptional load handling capabilities. This precision bearing is distinguished by its ability to simultaneously support substantial combined loads—significant radial loads and axial loads in both directions—within a compact design. Manufactured to a P6 (ABEC-3) tolerance class, it ensures reliable performance in high-speed and high-rigidity applications. Its pre-lubricated and open design facilitates efficient operation right out of the box.
QJ 313 MA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| QJ | Denotes the four-point contact ball bearing series. |
| 313 | Standard bore diameter code for a 65 mm bore. |
| MA | Indicates the bearing is pre-lubricated with a specific high-performance grease. |
QJ 313 MA Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: The unique raceway geometry allows the bearing to accommodate combined radial and bidirectional axial loads efficiently, functioning similarly to a paired duplex bearing set but in a single, space-saving unit. This results in a highly rigid assembly.
- High Load Capacity: With a dynamic load rating of 39,600 lbf and a static load rating of 35,100 lbf, this bearing is built to handle demanding operational conditions.
- Precision & High-Speed Performance: The P6 tolerance ensures precise running accuracy, while the brass cage provides stability and durability, contributing to a high limiting speed of 8,500 rpm.
- Optimized Material & Lubrication: Components made from chrome steel offer high wear resistance and durability. The bearing is pre-lubricated (MA suffix), ensuring immediate operational readiness and reducing maintenance needs.
QJ 313 MA Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery where precision and robust load capacity are critical. Key applications include:
- Industrial Robots (especially in robotic arms and rotary joints)
- Machine Tool Turntables and Indexing Tables
- Precision Gearboxes
- Wind Turbine Yaw and Pitch Systems
- Medical Imaging Equipment (e.g., CT scanners)
