QJ 306 N2MA
Four-Point Contact Bearings Ball Bearings
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Basic Information
Main Dimensions
Inner Ring Dimensions
Outer Ring Dimensions
Performance
Materials
Environment & Compliance
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QJ 306 N2MA Bearing Product Overview & Core Advantages
The QJ 306 N2MA is a metric single row four-point contact ball bearing engineered for exceptional performance in demanding applications. Its unique four-point contact design enables it to simultaneously withstand combined radial and axial loads from both directions, making it an ideal, compact solution for high-precision and high-rigidity systems. Manufactured to a P6 (ABEC-3) tolerance class, this bearing delivers the accuracy and reliability required for critical machinery, while its pre-lubrication ensures immediate operational readiness.
QJ 306 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| QJ 306 | Denotes the basic bearing series with a 30 mm bore diameter and a 72 mm outside diameter. |
| N2 | Indicates the bearing has two integral snap rings (one on each side) on the outer ring for simplified axial location within a housing. |
| MA | Signifies that the bearing is pre-lubricated with a specific, high-performance grease suitable for the stated operating temperature range. |
QJ 306 N2MA Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: The optimized raceway geometry creates four points of contact between the balls and raceways, providing exceptional stiffness and the ability to handle significant combined loads (radial and bidirectional axial) in a single, compact unit.
- High-Precision Components: Manufactured from chrome steel for rings and balls, and featuring a durable brass cage, this bearing ensures smooth operation, high limiting speed (17,000 rpm), and long service life.
- Simplified Assembly: The inclusion of snap rings (N2) on the outer ring eliminates the need for complex housing shoulders or separate retaining components, reducing assembly time and cost.
- Ready-to-Install: Pre-lubrication (MA) means the bearing is protected against corrosion from the outset and is immediately ready for service, supporting maintenance-free operation for extended periods within its designated temperature range.
QJ 306 N2MA Bearing Typical Application Areas
The QJ 306 N2MA is ideally suited for applications requiring high rigidity and compact design under combined loading conditions. Key industries and equipment include:
- Industrial Robotics: Used in robot arm joints and rotary actuators.
- Machine Tools: Applied in rotary tables, indexing heads, and CNC milling machine spindles.
- Material Handling: Found in turntables, slewing rings for small cranes, and conveyor system rollers.
- Aerospace & Defense: Utilized in radar platforms, missile guidance systems, and antenna positioning units.
