S71911 ACB/HCP4AQGA
Hybrid Ceramic Super Precision Bearings
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S71911 ACB/HCP4AQGA Bearing Product Overview & Core Advantages
The S71911 ACB/HCP4AQGA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. As a double row angular contact ball bearing, it can simultaneously support substantial combined loads—both radial and bidirectional axial loads—within a compact design envelope. Its construction with ceramic balls and a P4A super-precision tolerance class ensures superior running accuracy, low heat generation, and extended service life, making it ideal for high-speed, high-rigidity spindles and precision machinery.
S71911 ACB/HCP4AQGA Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| S71911 | Denotes the bearing series and size (55mm bore, 80mm OD, 52mm width). |
| ACB | Indicates a 25° contact angle and specific internal design for optimal load distribution. |
| HCP4A | Signifies a P4A super-precision tolerance class for extremely tight dimensional and running accuracy. |
| QGA | Specifies the universal matchable (SU) arrangement, allowing bearings to be mounted in pairs or sets without selective assembly. |
S71911 ACB/HCP4AQGA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The double row design provides significantly increased radial and axial stiffness compared to single row bearings, enabling stable support under heavy combined loads. The 25° contact angle is optimized for sustaining substantial axial loads in both directions.
High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage minimizes inertial forces, allowing for a high limiting speed of 34,000 rpm. This makes it an excellent high-speed bearing solution.
Precision & Longevity: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration. The sealed construction with pre-applied grease lubrication protects against contamination and provides reliable operation within a temperature range of -30°C to 110°C, reducing maintenance needs.
S71911 ACB/HCP4AQGA Bearing Typical Application Areas
This precision bearing is engineered for high-performance applications where accuracy, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring devices and laboratory equipment.
- High-Frequency Motors and Spindles: Where minimal vibration and heat generation are critical.
- Aerospace & Defense Systems: Gyroscopes, navigation systems, and other precision mechanisms.
