QJ 309 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 309 MA Bearing Product Overview & Core Advantages
The QJ 309 MA is a metric single row four-point contact ball bearing engineered for exceptional performance in demanding applications. This precision bearing is designed to simultaneously withstand combined loads, including radial loads and axial loads in both directions, making it an ideal compact solution. Manufactured to a P6 (ABEC-3) tolerance class, it ensures high running accuracy and reliability. Its pre-lubricated and open design is optimized for high-speed operation, with a limiting speed of 12,000 rpm, providing a robust and long-lasting performance.
QJ 309 MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix | Technical Meaning | Advantage |
|---|---|---|
| MA | Brass Cage | Provides high strength and excellent guidance for the balls, contributing to stable operation at high speeds. |
| Open (No Seal Suffix) | No Contact Seals | Minimizes friction, allowing for the maximum limiting speed. Ideal for applications where external sealing is provided. |
| Lubricated | Factory Pre-Lubricated | Ensures immediate operational readiness and reduces initial maintenance requirements. |
QJ 309 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, offering a compact and space-saving design.
High Rigidity and Load Capacity: The robust construction, featuring a brass cage (MA) and chrome steel components, provides high rigidity and dependable performance under significant dynamic (22,500 lbf) and static (18,675 lbf) loads.
Optimized for High-Speed Operation: The combination of an open design, a precision brass cage, and pre-lubrication enables a high limiting speed of 12,000 rpm, making it suitable for demanding rotational applications.
Precision and Reliability: Manufactured to P6 tolerance with tight dimensional controls on the bore diameter (45 mm), outside diameter (100 mm), and width (25 mm), ensuring consistent and precise performance in critical machinery.
QJ 309 MA Bearing Typical Application Areas
The QJ 309 MA is ideally suited for applications requiring high speed, precision, and the ability to handle complex load scenarios. Key industries and equipment include:
- Industrial Robotics: Used in robot arm joints and rotary units.
- Machine Tool Accessories: Ideal for rotary tables, indexing heads, and CNC milling machine spindles.
- Aerospace Actuation Systems: Employed in flight control mechanisms and landing gear systems.
- High-Speed Pumps and Compressors: Supports shafts under combined loads in demanding fluid handling equipment.
