71911 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 71911 ACDGA/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This single-row bearing features an extra light preload (Class A) and is manufactured to P4A tolerance class, ensuring superior running accuracy and minimal vibration. Its key advantage lies in its ability to handle high combined loads, particularly thrust loads in one direction, making it ideal for high-speed spindles and precision machinery where high rigidity and operational reliability are paramount.
71911 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| 71911 | Basic bearing series and size code (55mm bore, 80mm OD, 13mm width). |
| AC | Angular Contact design with a 25° contact angle for optimal thrust capacity. |
| D | High ceramic ball material (Silicon Nitride), reducing centrifugal forces and enabling higher speeds. |
| GA | Universal Matchable (SU) bearing supplied in a matched set of 3 for preloaded arrangements. |
| HC | High-Grade phenolic resin cage, offering excellent strength and speed capability. |
| P4A | Super Precision tolerance class, exceeding ABEC 7/ISO P4 standards for dimensional and running accuracy. |
Structural Features and Performance Benefits
High-Speed Performance: The combination of ceramic balls and a lightweight phenolic cage significantly reduces rotating mass, allowing for a very high limiting speed of 46,000 rpm. This makes it a premier choice for high-speed applications.
Rigidity and Load Capacity: The 25° contact angle and precision-ground raceways provide high stiffness and enable the bearing to support substantial radial and axial loads simultaneously. The dynamic load rating of 4095 lbf ensures long service life under demanding conditions.
Thermal and Dimensional Stability: Manufactured from chrome steel with tight dimensional tolerances, the bearing maintains precision and performance across its operating temperature range of -30°C to 110°C.
Pre-optimized for Systems: Being supplied as a universally matchable set allows for flexible mounting configurations (DB, DF, DT) to achieve the desired preload and system rigidity without selective sorting.
71911 ACDGA/HCP4A Bearing Typical Application Areas
The 71911 ACDGA/HCP4A is engineered for the most demanding high-precision and high-speed machinery, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and spindle drives requiring high accuracy and rigidity.
- Aerospace Systems: Gyroscopes, navigation instruments, and auxiliary power units.
- High-Frequency Motors and Spindles: Where extreme rotational speeds are critical.
