7004 ACD/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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7004 ACD/HCP4ADBA Bearing Product Overview & Core Advantages
The 7004 ACD/HCP4ADBA is a duplex back-to-back (DB) angular contact ball bearing engineered for high-precision applications requiring exceptional rigidity and speed performance. This P4A super-precision bearing features a ceramic ball and phenolic cage construction, enabling superior performance under combined radial and axial loads. With its extra light preload (Class A) and optimized 25° contact angle, it delivers outstanding rotational accuracy and minimal heat generation, making it ideal for demanding machine tool and industrial applications.
7004 ACD/HCP4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7004 | Basic bearing series with 20mm bore, 42mm OD, 24mm width |
| AC | Angular Contact design with 25° contact angle |
| D | Duplex arrangement (two bearings) |
| DB | Back-to-Back mounting configuration |
| HCP4A | High Carbon Phenolic cage with P4A tolerance class |
7004 ACD/HCP4ADBA Bearing Structural Features & Performance Benefits
Enhanced Rigidity & Load Capacity: The duplex back-to-back arrangement creates a rigid bearing system capable of withstanding combined radial and axial loads from both directions, providing exceptional stability under complex loading conditions.
High-Speed Performance: The combination of ceramic balls (reduced centrifugal forces) and phenolic cage enables operation at limiting speeds up to 103,000 rpm, while the extra light preload minimizes friction and heat generation.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls (±0.004mm on bore and OD), ensuring consistent performance and accuracy in precision applications.
Advanced Material Selection: Ceramic ball construction provides superior wear resistance, electrical insulation, and reduced thermal expansion compared to steel balls, while the phenolic cage offers excellent strength-to-weight ratio and smooth operation.
7004 ACD/HCP4ADBA Bearing Typical Application Areas
- Machine Tool Spindles - High-speed machining centers and precision grinding applications
- High-Speed Motors - Spindle motors and precision electric motors requiring minimal vibration
- Industrial Pumps & Compressors - Applications demanding high rotational accuracy and reliability
- Precision Instrumentation - Medical equipment, measuring devices, and optical systems
- Aerospace Components - Guidance systems and auxiliary power units requiring high-speed precision
