QJ 234 N2MA
Four-Point Contact Bearings Ball Bearings
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Part No.
Part No.
QJ 234 N2MA
Basic Information
Bearing type
Ball
System of measurement
Metric
Construction
Single Row
Weight
19.5 kg
Tolerance class
P6 (ABEC-3)
Seal type
Open
For load direction
Four Point Contact
Main Dimensions
Bore diameter
170 mm
Bore diameter tolerance
-0.018mm to 0
Outside diameter
310 mm
Outside diameter tolerance
-0.025mm to 0
Width
52 mm
Width tolerance
-0.05mm to 0
Chamfer dimension
4 mm
Distance from side face to load point
168 mm
Inner Ring Dimensions
Inner ring large-side shoulder diameter
204 mm
Outer Ring Dimensions
Shoulder diameter outer ring
243 mm
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
102375 lbf
Radial static load rating
162000 lbf
Limiting speed
3.4 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
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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QJ 234 N2MA Bearing Product Overview & Core Advantages
The QJ 234 N2MA is a Four Point Contact Ball Bearing designed for exceptional performance in demanding applications. This single row bearing is engineered to simultaneously withstand combined loads, including significant radial loads and axial loads in both directions, within a compact design. Manufactured to a P6 (ABEC-3) tolerance class, it delivers the high precision and high rigidity required for machine tools and other high-performance machinery. Its optimized internal geometry and brass cage contribute to reliable operation and long service life.
QJ 234 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| QJ 234 | Standard designation for a four-point contact ball bearing. |
| N2 | Indicates two circumferential lubrication grooves and three lubrication holes in the outer ring. |
| MA | Signifies that the bearing is supplied with a medium temperature, anti-wear grease lubrication. |
QJ 234 N2MA Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: The unique raceway geometry allows the bearing to handle combined radial and axial loads from both directions with a single bearing row, offering a compact and space-saving solution.
- High Rigidity and Load Capacity: With a radial dynamic load rating of 102,375 lbf and a static load rating of 162,000 lbf, this bearing provides robust support and high operational stability under heavy loads.
- Precision Performance: Manufactured to a P6 tolerance class, it ensures high running accuracy and low vibration, which is critical for precision applications.
- Optimized Lubrication: The N2 code signifies integrated lubrication features, and the MA suffix confirms the bearing is pre-lubricated with a high-quality grease suitable for a wide temperature range of -30°C to 110°C, ensuring long-term, maintenance-free operation.
- Durable Construction: Components made from chrome steel and a brass cage provide excellent durability and reliable performance at the limiting speed of 3,400 rpm.
QJ 234 N2MA Bearing Typical Application Areas
This bearing is ideally suited for applications requiring high precision and the ability to support complex load combinations. Key industries and equipment include:
- Machine Tool Spindles
- Industrial Gearboxes
- Turntables and Slewing Rings
- Precision Rotary Actuators
- Medical and Laboratory Equipment
