QJ 208 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 208 MA Bearing Product Overview & Core Advantages
The QJ 208 MA is a Four Point Contact Ball Bearing designed for exceptional performance in demanding applications. This precision bearing is engineered to simultaneously support substantial combined loads—significant radial loads and axial loads in both directions—within a remarkably compact cross-section. Its single-row design with a four-point contact geometry provides high rigidity and operational accuracy, making it an ideal solution for high-reliability machinery requiring precise rotational motion.
QJ 208 MA Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| QJ | Denotes the bearing type as a Four Point Contact Ball Bearing. |
| 208 | Standard bore diameter code, corresponding to a 40 mm bore. |
| MA | Indicates the bearing is lubricated with a specific high-performance grease suitable for the specified temperature range. |
QJ 208 MA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The unique four-point contact raceway design enables this single-row bearing to handle high combined radial and axial loads from any direction with minimal deflection, providing exceptional system stiffness.
Precision & Speed: Manufactured to a P6 (ABEC-3) tolerance class, it ensures smooth, quiet, and precise operation. The machined brass cage provides reliable guidance for the balls, contributing to stable performance at the specified limiting speed of 15,000 rpm.
Ready-to-Use & Durable: As an open but pre-lubricated bearing, it is supplied ready for immediate installation. The use of high-grade chrome steel for both rings and balls ensures long service life and high dynamic capacity.
QJ 208 MA Bearing Typical Application Areas
The QJ 208 MA is ideally suited for applications requiring compact design and high load capacity in multiple directions. Key industries and equipment include:
- Robotics and Automation (e.g., Robotic arm joints)
- Machine Tool Components (e.g., Rotary tables, Indexing heads)
- Aerospace Actuation Systems
- Medical Equipment (e.g., CT scanner gantries)
- Radar and Satellite Antenna Positioning Systems
