7004 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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7004 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The 7004 ACDGA/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. Engineered with a 25° contact angle and manufactured to P4A tolerance class, this bearing delivers superior running accuracy and rotational stability. Its extra light preload (Class A) minimizes deflection under load, making it ideal for high-speed spindles and precision machinery. The combination of a phenolic cage and ceramic balls contributes to lower friction, higher limiting speeds, and extended service life, establishing it as a top-tier solution for high-speed and high-rigidity applications.
7004 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7004 | Standard bearing series number | Defines the basic bearing dimensions: 20mm bore, 42mm OD, 12mm width. |
| AC | Angular Contact | Designed to support combined loads (radial and axial) simultaneously. |
| DGA | Universal Matchable (SU), 25° contact angle | Bearing is universally matchable and can be paired in various preloaded arrangements (back-to-back, face-to-face, tandem). |
| HCP4A | P4A Tolerance Class, Phenolic Cage | Denotes ultra-precision dimensional and running accuracy, combined with a lightweight phenolic cage for high-speed operation. |
7004 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The angular contact design with a 25° contact angle provides excellent resistance to combined loads, offering high axial and radial stiffness, which is crucial for minimizing shaft deflection in precision applications.
Superior High-Speed Performance: The lightweight phenolic cage and low-density ceramic balls (Silicon Nitride) significantly reduce centrifugal forces, enabling a very high limiting speed of 103,000 rpm. This construction also reduces heat generation and allows for smoother operation at extreme velocities.
Precision and Longevity: Manufactured to P4A tolerance class with tight dimensional controls on bore, outside diameter, and width, this bearing ensures minimal runout and vibration. The ceramic ball material offers superior wear resistance, corrosion resistance, and electrical insulation properties, leading to a longer operational life.
Universal Matching Capability: As a Universal Matchable (SU) bearing, the 7004 ACDGA/HCP4A can be flexibly mounted in sets (typically 3 bearings) to achieve specific preload and stiffness requirements without selective sorting, simplifying inventory and assembly processes.
7004 ACDGA/HCP4A Bearing Typical Application Areas
This precision bearing is ideally suited for high-performance machinery where speed, accuracy, and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC milling machines.
- Precision Instruments: Measuring equipment, optical scanners, and coordinate measuring machines (CMM).
- High-Speed Motors and Drives: Spindles for PCB drilling, dental handpieces, and turbo-molecular pumps.
- Aerospace and Defense Systems: Gyroscopes, navigation systems, and other critical rotating assemblies.
