7004 CD/HCP4ADT
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7004 CD/HCP4ADT
Basic Information
System of measurement
Metric
Weight
0.12 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
24 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
6.35 mm
Ball quantity
12
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3150 lbf
Radial static load rating
1912 lbf
Limiting speed
103 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Tandem (DT)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
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7004 CD/HCP4ADT Bearing Product Overview & Core Advantages
The 7004 CD/HCP4ADT is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This duplex tandem (DT) arrangement bearing set is preloaded and manufactured to P4A tolerance class, ensuring ultra-high running accuracy and system rigidity. Its primary advantage lies in its ability to handle high combined loads and achieve exceptional high-speed performance, making it ideal for precision spindles and other high-performance machinery.
7004 CD/HCP4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7004 | Basic bearing series and size designation (20mm bore, 42mm OD, 24mm width). |
| C | 15° contact angle, optimized for high-speed applications and axial load capacity. |
| D | Specifies a duplex tandem (DT) preloaded bearing set. |
| HC | Indicates the use of Hybrid Ceramic balls (Silicon Nitride). |
| P4A | Denotes an ultra-precision tolerance class with enhanced running accuracy requirements. |
7004 CD/HCP4ADT Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex tandem arrangement and preload create an exceptionally stiff bearing system capable of withstanding significant combined radial and axial loads in one direction, minimizing deflection under operational stresses.
- Superior High-Speed Performance: The combination of a lightweight phenolic resin cage and low-density ceramic balls reduces centrifugal forces, enabling a very high limiting speed of 103,000 rpm. This design minimizes friction and heat generation.
- Enhanced Durability and Life: Hybrid ceramic construction provides superior wear resistance, electrical insulation, and extended service life, especially in high-speed or marginally lubricated conditions.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on bore, outside diameter, and width, ensuring predictable and precise performance in the most demanding applications.
7004 CD/HCP4ADT Bearing Typical Application Areas
This bearing is specifically 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: Arm joints and high-accuracy actuators.
- High-Frequency Motors and Spindles: Used in PCB drilling, dental handpieces, and small precision motors.
- Aerospace & Defense Systems: Gyroscopes, navigation instruments, and auxiliary power units.
