7004 ACDGC/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7004 ACDGC/HCP4A
Basic Information
System of measurement
Metric
Weight
0.06 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
20 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
42 mm
Outside diameter tolerance
-0.004mm to 0
Width
12 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
12
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1872 lbf
Radial static load rating
934 lbf
Limiting speed
103 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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7004 ACDGC/HCP4A Bearing Product Overview & Core Advantages
The 7004 ACDGC/HCP4A is a single row angular contact ball bearing designed for exceptional precision and performance in demanding applications. Engineered to a P4A super precision tolerance, this bearing is optimized to handle combined radial and axial loads simultaneously. Its key advantages stem from a 25° contact angle and a Moderate (Class C) preload, delivering high system rigidity, precise rotational accuracy, and excellent high-speed capabilities. The use of a phenolic cage and ceramic balls further enhances its high-speed performance and operational longevity.
7004 ACDGC/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7004 | Basic bearing series and size designation (20mm bore, 42mm OD, 12mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| DGC | Designates a Moderate (Class C) preload and a phenolic (resin) cage. |
| HC | Indicates the use of Hybrid Ceramic components (ceramic balls with steel rings). |
| P4A | Specifies the super precision tolerance class, exceeding ABEC 7 standards. |
7004 ACDGC/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The 25° contact angle and factory-set Moderate preload eliminate internal clearance, providing high axial and radial stiffness for superior positional accuracy and reduced system vibration.
- Enhanced High-Speed Performance: The combination of a lightweight phenolic cage and low-density, hard ceramic balls reduces centrifugal forces, lowers operating temperatures, and allows for a high limiting speed of 103,000 rpm.
- Superior Load Capacity: The optimized internal geometry enables the bearing to support significant combined loads, with a dynamic load rating of 1872 lbf and a static load rating of 934 lbf.
- Universal Matchability (SU): This bearing is universally matchable, allowing multiple bearings to be mounted in sets (e.g., back-to-back or face-to-face) to share loads and increase overall system rigidity without selective assembly.
7004 ACDGC/HCP4A Bearing Typical Application Areas
This high-precision, high-speed bearing is ideally suited for applications requiring extreme accuracy and reliability, including:
- High-Frequency CNC Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Robotic Arms and Drives
- Advanced Dental and Medical Handpieces
- Aerospace Instrumentation and Gyroscopes
