7008 ACE/HCP4ALDT
Hybrid Ceramic Super Precision Bearings
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7008 ACE/HCP4ALDT Bearing Product Overview & Core Advantages
The 7008 ACE/HCP4ALDT is a high-precision duplex tandem angular contact ball bearing designed for demanding applications requiring exceptional rigidity and speed capabilities. This matched set bearing features a 25° contact angle and is manufactured to P4A super-precision tolerance standards. Its core advantage lies in its ability to handle combined loads (radial and axial) efficiently in a preloaded tandem configuration, providing maximum axial stiffness and positional accuracy. The use of ceramic balls and a phenolic cage enables superior high-speed performance and thermal stability, making it ideal for high-reliability, precision machinery.
7008 ACE/HCP4ALDT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7008 | Basic bearing series and size designation (40mm bore, 68mm OD, 30mm width) |
| ACE | Specific internal design and contact angle (25°) optimized for high-speed operation |
| HC | Hybrid Ceramic construction (steel rings with ceramic balls) |
| P4A | Super-precision tolerance class, exceeding ABEC 7/ISO P4 standards |
| DT | Duplex Tandem arrangement; two bearings matched for unidirectional axial load sharing |
7008 ACE/HCP4ALDT Bearing Structural Features & Performance Benefits
Hybrid Ceramic Design: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends service life at high speeds. This construction also provides superior resistance to electrical arcing and operates effectively with minimal lubrication.
Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent dimensional stability and guidance for the ceramic balls, contributing to smooth operation and the high limiting speed of 56,000 rpm.
Duplex Tandem (DT) Preload: The two bearings are factory-matched and preloaded in a tandem arrangement (DT). This configuration is engineered to support very high unidirectional axial loads and provides exceptional system rigidity, minimizing axial deflection under load.
Super-Precision Tolerances: Manufactured to P4A tolerance class with tight control on bore, outside diameter, and width, ensuring precise running accuracy, reduced vibration, and consistent performance in critical applications.
7008 ACE/HCP4ALDT Bearing Typical Application Areas
The 7008 ACE/HCP4ALDT 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 turning centers.
- Precision Robotics: High-accuracy robot arm joints and CNC rotary tables.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units (APUs).
- High-Frequency Motors/Spindles: Motors for PCB drilling and dental handpieces.
- Advanced Pumps & Compressors: High-speed compressors and turbine pumps.
