QJ 315 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 315 N2MA Bearing Product Overview & Core Advantages
The QJ 315 N2MA is a metric single row four-point contact ball bearing engineered for applications requiring exceptional precision and reliability. This bearing is specifically designed to simultaneously handle combined radial and axial loads from both directions with high efficiency. Its compact design, featuring a brass cage and P6 (ABEC-3) tolerance class, makes it an ideal solution for high-precision machinery where space constraints and operational accuracy are critical. The bearing comes pre-lubricated for immediate use and offers a robust performance within a wide temperature range.
QJ 315 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| QJ 315 | Denotes the basic bearing series, a four-point contact ball bearing with a 75mm bore. |
| N2 | Indicates the bearing has two integral circlars (snap rings) on the outer ring for simplified axial location within a housing. |
| MA | Signifies that the bearing is filled with a specific high-performance lubricant, ensuring optimal performance and reduced maintenance from the start of operation. |
QJ 315 N2MA Bearing Structural Features & Performance Benefits
Four-Point Contact Design: The unique raceway geometry allows the bearing to support combined radial and axial loads from any direction with a single bearing row, offering a compact and weight-saving solution compared to traditional bearing arrangements.
High Rigidity and Load Capacity: The robust chrome steel construction and precise geometry contribute to high rigidity, enabling stable operation under significant dynamic and static loads (48,600 lbf dynamic / 45,000 lbf static).
Precision and Speed: Manufactured to a P6 tolerance class and featuring a durable brass cage, this bearing maintains accuracy and supports a limiting speed of 7,500 rpm, making it suitable for high-speed applications.
Simplified Assembly: The inclusion of snap rings (N2) on the outer ring simplifies housing design and installation, reducing assembly time and cost.
QJ 315 N2MA Bearing Typical Application Areas
The QJ 315 N2MA is widely used in demanding industrial sectors, including:
- Industrial Robotics (e.g., robot arm joints and rotators)
- Machine Tools (e.g., rotary tables, indexing heads)
- Material Handling Equipment (e.g., slewing rings for cranes and excavators)
- Aerospace Actuation Systems
- Precision Medical Equipment
