71907 ACD/HCP4ADT
Hybrid Ceramic Super Precision Bearings
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71907 ACD/HCP4ADT Bearing Product Overview & Core Advantages
The 71907 ACD/HCP4ADT is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This duplex tandem (DT) arrangement bearing set is preloaded and manufactured to a P4A tolerance class, ensuring superior running accuracy and system rigidity. Its key advantage lies in its ability to handle high combined loads (radial and axial) in one direction with maximum stiffness, making it ideal for high-speed spindles and precision machinery where minimal deflection is critical. The use of a phenolic cage and ceramic balls contributes to its high-speed capabilities and extended service life.
71907 ACD/HCP4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71907 | Basic bearing series and size designation (35mm bore, 55mm OD, 20mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex Tandem (DT) arrangement, where two bearings are paired to increase axial load capacity in one direction. |
| HC | Hybrid Ceramic, indicating the use of ceramic balls for reduced friction and higher speed potential. |
| P4A | High precision tolerance class, exceeding ABEC 7/ISO P4 standards for superior dimensional and running accuracy. |
| Open (from spec) | No integral seals or shields, allowing for higher limiting speeds and custom lubrication schemes. |
| Lubricated (from spec) | The bearing is pre-lubricated from the factory for immediate operation. |
71907 ACD/HCP4ADT Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The duplex tandem arrangement and preload create an exceptionally rigid bearing system, effectively resisting deflection under heavy combined loads. This configuration is optimized for applications with dominant axial loads in one direction.
Superior High-Speed Performance: The combination of a lightweight phenolic cage and low-density ceramic balls significantly reduces centrifugal forces, enabling a high limiting speed of 56,000 rpm. The open design further minimizes friction and heat generation at high velocities.
Enhanced Durability and Temperature Resistance: Ceramic balls are harder and more wear-resistant than steel, leading to a longer operational life. The phenolic cage maintains its integrity across the specified temperature range of -30°C to 110°C.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls on the bore, outside diameter, and width, this bearing ensures predictable performance and minimal runout in precision assemblies.
71907 ACD/HCP4ADT Bearing Typical Application Areas
This bearing is engineered for high-performance applications where speed, precision, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and drilling spindles.
- Precision Robotics: High-accuracy robotic arms and joints.
- Aerospace & Defense: Gyroscopes, radar systems, and flight control mechanisms.
- High-Frequency Motors and Spindles: Motors for PCB drilling and dental handpieces.
- Advanced Pump and Compressor Systems: Where high axial load capacity is required.
