QJ 308 N2PHAS
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 308 N2PHAS Bearing Product Overview & Core Advantages
The QJ 308 N2PHAS is a metric four-point contact ball bearing engineered for applications requiring high precision and robust load handling. This single row bearing is distinguished by its ability to simultaneously support significant combined loads, including radial loads and bidirectional axial loads, within a compact design. Manufactured to a P6 (ABEC-3) tolerance class, it delivers exceptional running accuracy and reliability for demanding industrial environments. Its optimized internal geometry and high-quality materials ensure superior performance and long service life.
QJ 308 N2PHAS Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| QJ 308 | Denotes the basic bearing type: a four-point contact ball bearing with a 40mm bore diameter. |
| N2 | Indicates snap ring grooves on the outer ring, facilitating secure axial location within a housing. |
| P | Specifies the P6 tolerance class (equivalent to ABEC-3), ensuring high precision and minimal runout. |
| H | Signifies that the bearing is pre-lubricated with grease. |
| AS | Represents a specific internal design and clearance optimized for the bearing's performance characteristics. |
QJ 308 N2PHAS 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 weight-saving solution. This design provides high axial rigidity.
High-Precision Components: Manufactured from chrome steel for both rings and balls, the bearing ensures high durability and wear resistance. The PEEK (Polyetheretherketone) cage is lightweight, strong, and suitable for high-speed operation, contributing to the limiting speed of 14,000 rpm.
Enhanced Mounting & Sealing: The N2 snap ring groove simplifies installation and provides secure axial positioning. As an open bearing, it is designed for integration into systems with external sealing solutions, allowing for optimal application-specific lubrication.
Pre-Lubricated for Immediate Use: The bearing is factory-filled with grease, making it ready for immediate installation and operation, reducing initial setup time.
QJ 308 N2PHAS Bearing Typical Application Areas
The QJ 308 N2PHAS is ideally suited for high-performance applications where space, precision, and load capacity are critical. Key industries and equipment include:
- Robotics and Automation: Used in robot arm joints and rotary actuators.
- Machine Tools: Applied in rotary tables, indexing heads, and spindle supports.
- Aerospace and Defense: Suitable for radar platforms, gyroscopes, and control surface actuators.
- Medical Equipment: Found in CT scanner gantries and precision rotary stages.
- Industrial Machinery: Used in slewing rings for small cranes, welding positioners, and turntables.
