71918 ACE/HCP4ADT
Hybrid Ceramic Super Precision Bearings
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71918 ACE/HCP4ADT Bearing Product Overview & Core Advantages
The 71918 ACE/HCP4ADT is a high-precision duplex tandem angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. This P4A tolerance class bearing features a 25° contact angle and is preloaded in a Duplex Tandem (DT) arrangement, enabling it to accommodate very high unidirectional axial loads while maintaining superior rotational precision. Its construction with a phenolic cage and ceramic balls contributes to high-speed capability, low friction, and extended service life, making it an ideal solution for high-performance spindles and precision machinery.
71918 ACE/HCP4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Standard bearing series and size designation (90mm bore, 125mm OD, 36mm width). |
| ACE | Indicates a 25° contact angle and specific internal design optimizations. |
| HC | Signifies the use of Hybrid Ceramic balls (Silicon Nitride). |
| P4A | Denotes an ultra-high precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
| DT | Specifies the Duplex Tandem preload arrangement for maximum axial stiffness and load capacity in one direction. |
71918 ACE/HCP4ADT Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The duplex tandem arrangement pairs two bearings to act as a single, highly rigid unit. This configuration is specifically engineered to support exceptionally high unidirectional axial loads, making it far superior to a single bearing for thrust-heavy applications. The 25° contact angle further optimizes the axial load carrying capability.
High-Speed Performance: The combination of a lightweight phenolic resin cage and low-density, hard ceramic balls significantly reduces centrifugal forces and rolling friction. This allows the bearing to achieve a high limiting speed of 15,000 rpm with minimal heat generation, ensuring stable operation under demanding conditions.
Precision and Longevity: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration for superior rotational accuracy. The hybrid ceramic design offers increased durability, electrical resistance, and the ability to operate effectively within a temperature range of -30°C to 110°C.
71918 ACE/HCP4ADT Bearing Typical Application Areas
The 71918 ACE/HCP4ADT is engineered for high-end applications where precision, speed, and axial stiffness are paramount. Key industries and machinery include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: High-accuracy robotic arms and joints.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and auxiliary power units.
- High-Frequency Spindles: PCB drilling and routing machines.
