7004 CD/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7004 CD/HCP4ADBA
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 Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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7004 CD/HCP4ADBA Bearing Product Overview & Core Advantages
The 7004 CD/HCP4ADBA is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement provides superior stability when handling combined loads (radial and axial) from both directions. Manufactured to P4A tolerance class, it delivers ultra-precise running characteristics. The use of ceramic balls and a phenolic cage contributes to its high-speed capability, low heat generation, and extended service life, making it ideal for demanding, high-precision machinery.
7004 CD/HCP4ADBA Bearing Model Code Explained, Specifications & Naming Convention
The model number 7004 CD/HCP4ADBA is decoded as follows:
- 7004: Basic series designation, indicating a 20mm bore, 42mm OD, and 24mm width.
- C: 15° contact angle.
- D: Indicates a duplex (two bearings in a set) configuration.
- HCP4A: Denotes the tolerance class P4A (higher than ABEC 7) and specific internal design for high precision.
- DB: Specifies the Back-to-Back matched arrangement.
- A: Indicates Extra Light preload.
7004 CD/HCP4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The back-to-back duplex arrangement creates a wide effective spread, significantly increasing moment rigidity and providing excellent operational stability under complex loading conditions.
- Superior Load Capacity: Engineered to handle significant combined radial and axial loads from both directions simultaneously, a hallmark of angular contact bearings in a DB set.
- High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic resin cage allows for a very high limiting speed of 103,000 rpm, minimizing friction and heat buildup.
- Precision & Longevity: The P4A tolerance class ensures minimal runout and vibration. Ceramic balls are electrically insulating, corrosion-resistant, and reduce wear, leading to a longer operational life and consistent performance.
7004 CD/HCP4ADBA Bearing Typical Application Areas
This high-precision bearing is typically specified in advanced industrial and technological equipment, including:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Robotics and Automation Arms
- Advanced Medical and Dental Equipment Spindles
- Aerospace Actuators and Control Systems
