71911 ACD/HCP4ATBTB
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 ACD/HCP4ATBTB is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. This metric bearing is supplied as a triplex back-to-back (TBT) matched set of three bearings, enabling it to handle combined loads—significant radial and axial loads in both directions—simultaneously. Its P4A tolerance class and light preload (Class B) ensure smooth, precise operation with minimal runout, making it ideal for high-speed spindles and other high-performance machinery where high rigidity and positional accuracy are critical.
71911 ACD/HCP4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Basic bearing series and size designation (55mm bore, 80mm OD). |
| ACD | Contact Angle of 25° and High Precision design. |
| HC | Hybrid Ceramic: Ceramic balls with steel rings. |
| P4A | Ultra-high precision tolerance class, exceeding ABEC 7/ISO P4. |
| TBT | Triplex Back-to-Back arrangement of three matched bearings. |
| Open | No seal/shield, optimized for high-speed and controlled lubrication systems. |
Structural Features and Performance Benefits
High Rigidity and Load Capacity: The triplex back-to-back (TBT) arrangement creates an extremely rigid bearing system, effectively resisting complex moment loads and providing stable support for spindles. This configuration allows the set to handle high combined radial and axial loads.
Superior High-Speed Performance: The combination of a lightweight phenolic cage, ceramic balls (which reduce centrifugal forces and friction), and an open design contributes to an exceptionally high limiting speed of 34,000 rpm. The 25° contact angle provides an optimal balance between axial load capacity and speed capability.
Extended Service Life and Thermal Stability: Hybrid ceramic construction offers increased durability, reduced wear, and superior performance in high-temperature environments (up to 110°C). The phenolic cage provides excellent dimensional stability and operates effectively across a wide temperature range (-30°C to 110°C).
71911 ACD/HCP4ATBTB Bearing Typical Application Areas
This precision bearing set is engineered for the most demanding high-speed and high-precision applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving, and high-frequency motor spindles.
- Aerospace and Defense Systems: Gyroscopes, navigation instruments, and auxiliary power units.
- Medical Equipment: High-speed dental handpieces and surgical drill spindles.
