QJ 217 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 217 N2MA Bearing Product Overview & Core Advantages
The QJ 217 N2MA is a metric single row four-point contact ball bearing engineered for applications requiring exceptional precision and load handling capabilities. This bearing is specifically designed to simultaneously accommodate combined radial and axial loads from both directions, making it an ideal solution for compact, high-rigidity arrangements. Manufactured to P6 (ABEC-3) tolerance class, it delivers high running accuracy and reliable performance in demanding industrial environments. Its optimized design provides a high limiting speed and robust dynamic and static load ratings, ensuring long service life and operational stability.
QJ 217 N2MA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| QJ 217 | Denotes the basic bearing type: a four-point contact ball bearing with a 85 mm bore diameter. |
| N2 | Indicates the bearing has two integral guide ribs on the outer ring for precise axial location. |
| MA | Signifies that the bearing is pre-lubricated with a specific high-performance grease suitable for the designated temperature range. |
QJ 217 N2MA Bearing Structural Features & Performance Benefits
- Four-Point Contact Design: The unique raceway geometry allows the bearing to support significant combined radial and axial loads from any direction, effectively replacing a traditional bearing pair in a more compact envelope.
- High Rigidity & Precision: Manufactured from Chrome Steel with a P6 tolerance class, this bearing ensures minimal runout and high positional accuracy, which is critical for precision machinery.
- Optimized Cage & Speed Performance: The brass cage provides excellent strength and guidance at high rotational speeds, contributing to the high limiting speed of 7,500 rpm.
- Pre-Lubrication & Readiness: The MA suffix indicates factory-applied lubrication, making the bearing ready for immediate installation and operation within its specified temperature range of -30°C to 110°C.
QJ 217 N2MA Bearing Typical Application Areas
The QJ 217 N2MA is widely used in applications requiring high precision and the ability to handle complex load scenarios. Key industries and equipment include:
- Industrial Robots: Used in robotic arms and joints for precise motion control.
- Machine Tool Spindles: Provides high rigidity and accuracy in milling and turning centers.
- Turntables and Indexing Tables: Ideal for applications requiring precise angular positioning under combined loads.
- Precision Gearboxes: Supports shafts and handles reaction forces in high-performance transmission systems.
