QJ 328 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 328 N2MA Bearing Product Overview & Core Advantages
The QJ 328 N2MA is a four-point contact ball bearing designed for exceptional performance in demanding applications. This metric single row bearing excels at simultaneously handling combined radial loads and substantial axial loads from both directions. Engineered with P6 (ABEC-3) precision tolerance, it delivers high running accuracy and reliable operation. The optimized bearing dimensions (140 mm bore, 300 mm OD) provide an excellent balance between load capacity and space constraints, making it ideal for applications requiring high rigidity and precise rotational characteristics.
QJ 328 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Performance Benefit |
|---|---|---|
| N2 | Two-piece machined brass cage | Enhanced stability at high speeds and better lubrication distribution |
| MA | Pre-lubricated with high-performance grease | Reduced maintenance requirements and consistent performance across the operating temperature range |
QJ 328 N2MA Bearing Structural Features & Performance Benefits
Four-Point Contact Design: The unique raceway geometry enables the bearing to accommodate combined radial and axial loads in both directions with a single bearing row, providing space-saving advantages while maintaining high load capacity.
Precision Construction: Manufactured to P6 tolerance class with chrome steel rings and balls, ensuring consistent performance, minimal vibration, and extended service life in precision applications.
High-Speed Capability: The brass cage (N2) provides excellent dimensional stability and guidance at the limiting speed of 3,800 rpm, while the optimized internal geometry reduces friction and heat generation.
Robust Load Ratings: With a dynamic load rating of 112,500 lbf and static load rating of 156,375 lbf, this bearing delivers reliable performance under heavy combination loads.
Temperature Resilience: Operating range of -30°C to 110°C ensures consistent performance across various environmental conditions and applications.
QJ 328 N2MA Bearing Typical Application Areas
- Industrial Robotics: Rotary joints and positioning systems requiring high precision and moment load capacity
- Machine Tool Components: Rotary tables, indexing heads, and precision spindles
- Material Handling Equipment: Turntables, slewing rings, and rotational mechanisms
- Wind Turbine Systems: Yaw and pitch control mechanisms
- Construction Machinery: Excavator slewing rings and crane rotation systems
- Aerospace Equipment: Actuation systems and rotational mechanisms requiring high reliability
