QJ 218 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 218 N2MA Bearing Product Overview & Core Advantages
The QJ 218 N2MA is a Four Point Contact Ball Bearing designed for applications requiring exceptional performance under combined loads. This single row metric bearing features a compact design that can simultaneously accommodate significant radial loads and axial loads in both directions. Manufactured to P6 (ABEC-3) tolerance class, it delivers high running accuracy and reliability for precision machinery. Its optimized internal geometry and brass cage contribute to stable operation, making it an ideal solution for demanding industrial environments.
QJ 218 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| QJ 218 | Standard four-point contact ball bearing designation with 90mm bore diameter |
| N2 | Snap ring groove on the outer ring for secure axial positioning |
| MA | Brass cage design optimized for high-speed applications |
QJ 218 N2MA Bearing Structural Features & Performance Benefits
Four Point Contact Design: The unique raceway geometry enables the bearing to handle combined radial and axial loads efficiently, functioning similarly to a double row bearing in a more compact single row configuration.
High Precision Construction: Manufactured to P6 tolerance class with precise dimensional control, ensuring consistent performance and minimal vibration in precision applications.
Optimized Cage Design: The brass cage (MA) provides excellent strength and wear resistance, contributing to the bearing's high-speed capability with a limiting speed of 7,000 rpm.
Robust Load Capacity: With dynamic load rating of 41,850 lbf and static load rating of 45,000 lbf, this bearing offers reliable performance under substantial bearing loads.
Secure Mounting: The snap ring groove (N2) facilitates easy installation and provides reliable axial positioning within the housing.
QJ 218 N2MA Bearing Typical Application Areas
- Machine Tool Spindles - Precision rotating components requiring high accuracy and stiffness
- Industrial Robots - Robotic joints and rotating mechanisms demanding compact design and high load capacity
- Gearboxes - Power transmission systems where combined loads are present
- Pumps and Compressors - Rotating equipment requiring reliable performance under axial and radial loads
- Material Handling Equipment - Bearings for turntables and rotating platforms
- Aerospace Components - Applications requiring precision bearings with excellent load distribution
