7018 ACD/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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7018 ACD/P4A Bearing Product Overview & Core Advantages
The 7018 ACD/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This single-row bearing is manufactured to P4 (ABEC-7) tolerance class, ensuring minimal runout and superior performance. Its key advantage lies in its ability to accommodate high combined loads, efficiently handling both substantial radial loads and unidirectional axial loads due to its 25° contact angle. The phenolic resin cage and preloaded configuration contribute to its high-speed capability and operational stability, making it an ideal choice for high-reliability, precision machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 7018 | Standard bearing series designation, indicating the basic dimensions: 90mm bore, 140mm OD, 24mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a high rigid design, typically involving optimized internal geometry. |
| P4A | Indicates a P4 (ABEC-7) precision tolerance class with specific running accuracy requirements. |
7018 ACD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4 tolerance class with a phenolic resin cage, this bearing ensures exceptional dimensional stability and minimal vibration, which is critical for high-precision applications.
- Superior Load Capacity: The 25° contact angle and robust construction using chrome steel for rings and balls enable it to support high radial dynamic load ratings of 16,672 lbf and effectively manage significant combined loads.
- Optimized High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, allowing for a high limiting speed of 13,000 rpm. The bearing is supplied lubricated for immediate use and optimal performance at high velocities.
- Preload and Stability: The bearing is supplied with preload, which increases system stiffness, reduces axial and radial play, and enhances positional accuracy under operational loads.
7018 ACD/P4A Bearing Typical Application Areas
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Gearboxes and Transmissions: Where high rigidity and load capacity are required.
- High-Frequency Motors and Spindles: Benefiting from the high limiting speed and stability.
- Medical and Laboratory Equipment: Such as centrifuges and precision scanners.
- Robotics and Automation: Particularly in articulated arm joints and precision drive units.
