QJ 309 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 309 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
1.05 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.01mm to 0
Outside diameter
100 mm
Outside diameter tolerance
-0.013mm to 0
Width
25 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
1.5 mm
Distance from side face to load point
51 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
58 mm
Outer Ring Dimensions
Shoulder diameter outer ring
81.2 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
22500 lbf
Radial static load rating
18675 lbf
Limiting speed
12 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 309 N2MA Bearing Product Overview & Core Advantages
The QJ 309 N2MA is a Four Point Contact Ball Bearing designed for applications requiring high precision and exceptional load handling. This single row bearing excels at simultaneously supporting combined radial and axial loads from both directions with a compact cross-section. Manufactured to P6 (ABEC-3) tolerance, it delivers high running accuracy and reliability. Its optimized internal geometry and brass cage contribute to stable operation, making it an ideal choice for high-performance rotary systems.
QJ 309 N2MA Bearing Model Code Explained, Specifications & Naming Convention
The model designation QJ 309 N2MA provides specific technical details:
- QJ: Denotes a Four Point Contact Ball Bearing.
- 309: Standard size designation (45mm bore, 100mm OD, 25mm width).
- N2: Indicates the bearing is supplied with a pre-lubrication of high-performance grease.
- MA: Specifies the use of a brass cage for enhanced strength and speed capability.
QJ 309 N2MA Bearing Structural Features & Performance Benefits
- Four Point Contact Design: The unique raceway geometry allows the bearing to accommodate combined radial and axial loads from any direction with a single bearing row, offering a compact and efficient solution.
- High Load Capacity: With a dynamic load rating of 22,500 lbf and a static load rating of 18,675 lbf, it is engineered for demanding applications.
- Precision Performance: Manufactured to P6 tolerance class, it ensures high running accuracy and minimal vibration for smooth operation.
- Optimized for Speed: The robust brass cage (MA) provides excellent guidance and stability, supporting a limiting speed of 12,000 rpm.
- Pre-Lubricated for Service Life: The N2 suffix confirms the bearing is pre-lubricated with high-quality grease, ensuring immediate operation and long-term performance within a temperature range of -30°C to 110°C.
QJ 309 N2MA Bearing Typical Application Areas
This bearing is ideally suited for high-precision and high-load applications, including:
- Industrial Robotic Arms and Grippers
- Precision Turntables and Indexing Tables
- Machine Tool Spindles and Rotary Unions
- Aerospace Actuators and Control Systems
- High-Speed Pumps and Compressors
