7011 ACD/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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7011 ACD/P4A Bearing Product Overview & Core Advantages
The 7011 ACD/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Engineered to a P4 (ABEC-7) tolerance class, it excels in high-speed scenarios while simultaneously supporting significant combined loads (radial and axial). Its 25° contact angle is optimized for handling substantial axial loads in one direction. The phenolic resin cage and pre-lubrication contribute to its high-speed capability and reliable, long-term performance in demanding industrial environments.
7011 ACD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Interpretation | Technical Significance |
|---|---|---|
| 7011 | Basic Bearing Series & Size | Denotes a metric series angular contact ball bearing with a 55mm bore, 90mm OD, and 18mm width. |
| AC | Angular Contact | The bearing is designed with a specific contact angle to support combined loads. |
| D | High Contact Angle | Indicates a 25° contact angle, providing high axial load capacity. |
| P4 | Tolerance Class | Corresponds to ABEC-7, signifying ultra-precision manufacturing tolerances for minimal runout and vibration. |
| A | Preload | Specifies that the bearing is supplied with a light preload for enhanced rigidity and precise shaft positioning. |
7011 ACD/P4A Bearing Structural Features & Performance Benefits
High Rigidity and Precision: The P4 tolerance class ensures extremely tight dimensional and running accuracy, which is critical for applications requiring high positional precision and smooth operation. The light preload (suffix A) eliminates internal clearance, resulting in superior system stiffness.
Optimized Load Capacity: The 25° contact angle design allows this bearing to support high axial loads in one direction in addition to radial loads, making it ideal for applications with significant thrust forces.
High-Speed Performance: The lightweight and robust phenolic resin cage ensures stable operation and reduced centrifugal forces at high speeds, contributing to the bearing's limiting speed of 22,000 rpm.
Material and Lubrication: Manufactured from high-grade chrome steel for both rings and balls, the bearing offers excellent durability and fatigue life. It is supplied pre-lubricated for immediate use and reliable initial operation.
7011 ACD/P4A Bearing Typical Application Areas
The 7011 ACD/P4A is engineered for high-performance machinery where precision, speed, and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Gearboxes: Especially in high-speed transmission systems.
- High-Frequency Motors and Spindles: Used in PCB drilling, dental handpieces, and small precision tools.
- Robotics: In high-accuracy joints and arm linkages.
- Aerospace Actuation Systems: Where reliability and precision under load are critical.
