QJ 306 MA
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 MA Bearing Product Overview & Core Advantages
The QJ 306 MA is a metric single row four-point contact ball bearing engineered for applications requiring exceptional precision and load handling capabilities. This bearing is specifically designed to simultaneously accommodate combined radial and axial loads from any direction, making it an ideal solution for compact, high-rigidity assemblies. Manufactured to a P6 (ABEC-3) tolerance class, it delivers high running accuracy and reliable performance in demanding operational environments. Its optimized internal geometry and high-quality materials ensure long service life and stable operation.
QJ 306 MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| QJ | Designates a four-point contact ball bearing design. |
| 306 | Standard bore diameter code (30 mm) and dimension series. |
| M | Indicates the bearing is supplied with a brass cage. |
| A | Specifies an optimized internal geometry and contact angle for enhanced axial load capacity. |
QJ 306 MA Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: The unique raceway geometry allows the bearing to support significant combined radial and axial loads in both directions with a single bearing row, offering a compact and weight-saving solution.
- High Rigidity & Precision: Manufactured to P6 tolerance with precise dimensional control, this bearing provides high running accuracy and system stiffness, crucial for applications with minimal deflection requirements.
- Robust Material Construction: The use of chrome steel for rings and balls, combined with a durable brass cage, ensures high dynamic capacity, wear resistance, and reliable operation at the specified limiting speed of 17,000 rpm.
- Optimized Load Point: The defined distance from the side face to the load point (36 mm) contributes to stable moment load support and precise integration into the assembly.
QJ 306 MA Bearing Typical Application Areas
The QJ 306 MA is ideally suited for high-performance applications across various industries, including:
- Robotics: Used in robot arm joints and rotary units for precise motion control.
- Machine Tools: Applied in rotary tables, indexing heads, and spindle supports.
- Aerospace & Defense: Suitable for radar bases, gyroscopes, and control mechanisms.
- Industrial Machinery: Found in turntables, swivel mechanisms, and other equipment requiring compact, high-capacity rotary support.
