QJ 312 PHAS
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 312 PHAS
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
Peek
Environment & Compliance
REACH
Compliant
ROHS
Compliant
Technical Drawings
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In Stock
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QJ 312 PHAS Bearing Product Overview & Core Advantages
The QJ 312 PHAS is a metric four-point contact ball bearing engineered for applications requiring exceptional precision and load handling capabilities. This single-row bearing is distinguished by its ability to simultaneously support substantial combined loads, including radial loads and axial loads in both directions. Manufactured to P6 (ABEC-3) tolerance class, it delivers high running accuracy and reliability. Its compact design, featuring a 60 mm bore and 130 mm outside diameter, makes it an ideal solution for space-constrained, high-performance machinery demanding high rigidity and operational stability.
QJ 312 PHAS Bearing Model Code Explained, Specifications & Naming Convention
The QJ 312 PHAS model designation provides specific technical information:
- QJ 312: Denotes the basic bearing series, a four-point contact ball bearing with a 60mm bore and 130mm OD.
- P: Indicates a P6 tolerance class, signifying higher precision than standard bearings.
- H: Specifies a hardened bearing for increased durability and load capacity.
- A: Denotes an optimized internal design for enhanced performance.
- S: Signifies that the bearing is supplied pre-lubricated.
QJ 312 PHAS Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: The raceway geometry allows the bearing to sustain significant combined radial and axial loads from any direction with a single bearing row, simplifying assembly and saving space.
- High Rigidity and Precision: Built to a P6 tolerance class with a Peek cage, this bearing ensures minimal runout and stable operation under load, contributing to superior system rigidity.
- Optimized for High-Speed Operation: The lightweight and robust Peek polymer cage minimizes centrifugal forces, enabling a high limiting speed of 9,000 rpm. The pre-lubrication ensures smooth operation from startup.
- Durable Construction: Components made from chrome steel provide excellent wear resistance and a long service life under demanding conditions.
- Pre-Lubricated & Ready-to-Install: The bearing is supplied with lubricant, facilitating easy installation and immediate operation without additional greasing.
QJ 312 PHAS Bearing Typical Application Areas
This bearing is ideally suited for high-precision and high-load applications, including:
- Industrial Robots (particularly in robotic arms and rotary joints)
- Precision Machine Tool Spindles and indexing tables
- Turntables and slewing rings for material handling and construction equipment
- Aerospace Actuation Systems
- Medical and Laboratory Automation Equipment
