QJ 307 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 307 MA Bearing Product Overview & Core Advantages
The QJ 307 MA is a four-point contact ball bearing designed for exceptional performance in demanding applications. This single-row bearing is engineered to simultaneously accommodate combined loads, including radial loads and axial loads from both directions, making it an extremely versatile and space-saving solution. Manufactured to a P6 (ABEC-3) tolerance class, it delivers the high precision and high rigidity required for applications where accuracy and reliability are paramount. Its optimized internal geometry and high-quality materials ensure stable operation and a long service life.
QJ 307 MA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| QJ | Denotes the basic series as a four-point contact ball bearing. |
| 307 | Specifies the bearing size: 35 mm bore, 80 mm OD, 21 mm width. |
| M | Indicates the use of a brass cage, which provides excellent strength and is suitable for high-speed operation. |
| A | Signifies an optimized internal design for enhanced load-carrying capacity. |
QJ 307 MA 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, resulting in a compact and highly rigid assembly.
- High-Precision Construction: Manufactured to P6 tolerance, this bearing ensures minimal runout and precise rotational accuracy, which is critical for applications like machine tool spindles.
- Robust Material Selection: The chrome steel rings and balls, combined with a durable brass cage, offer high durability, resistance to wear, and reliable performance at the specified limiting speed.
- Optimized Load Points: The defined distance from the side face to the load point ensures stable mounting and effective force transmission, contributing to the bearing's high dynamic and static load ratings.
QJ 307 MA Bearing Typical Application Areas
The QJ 307 MA is ideally suited for high-performance machinery and precision equipment, including:
- Machine Tool Spindles
- Industrial Robots and Robotic Arms
- Precision Gearboxes
- Turntables and Indexing Tables
- Aerospace Actuation Systems
