7020 ACD/HCP4ADBB
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7020 ACD/HCP4ADBB
Basic Information
System of measurement
Metric
Weight
2.09 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
100 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
150 mm
Outside diameter tolerance
-0.004mm to 0
Width
48 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
15.875 mm
Ball quantity
22
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
28575 lbf
Radial static load rating
36000 lbf
Limiting speed
21 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
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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7020 ACD/HCP4ADBB Bearing Product Overview & Core Advantages
The 7020 ACD/HCP4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and high rigidity. This matched back-to-back (DB) arrangement is preloaded to Light / Class B specifications, ensuring optimal stiffness and minimal axial/radial runout. Its construction with ceramic balls and a phenolic cage enables superior high-speed performance and thermal stability, making it ideal for handling combined loads in demanding environments.
7020 ACD/HCP4ADBB Bearing Model Code Explained, Specifications & Naming Convention
The model number 7020 ACD/HCP4ADBB is decoded as follows:
- 7020: Basic series designation, indicating a 100mm bore and 150mm outside diameter.
- AC: Angular Contact design with a 25° contact angle.
- D: Indicates a Duplex Back-to-Back (DB) matched set.
- HCP4A: Denotes the P4A tolerance class, signifying very high precision levels for bore, outside diameter, and width.
- DBB: Specifies the Light preload (Class B) applied to the matched set.
7020 ACD/HCP4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The duplex back-to-back configuration and light preload provide exceptional system stiffness, crucial for minimizing deflection under combined radial and axial loads. Manufactured to P4A tolerance class, it guarantees supreme running accuracy.
- Enhanced Speed & Thermal Performance: The combination of silicon nitride ceramic balls and a lightweight phenolic resin cage reduces centrifugal forces and friction, allowing for a high limiting speed of 21,000 rpm. This setup also offers improved resistance to thermal expansion.
- Superior Load Capacity: Engineered to support high dynamic and static load ratings (28,575 lbf and 36,000 lbf respectively), this bearing is built for longevity and reliability in strenuous operating conditions.
- Optimized for Precision Applications: The open seal type allows for custom lubrication schemes, while the precise bearing dimensions and tight tolerances ensure consistent performance in high-precision assemblies.
7020 ACD/HCP4ADBB Bearing Typical Application Areas
This high-performance duplex bearing is ideally suited for:
- Machine Tool Spindles: Providing the high rigidity and speed necessary for precision machining centers, grinding spindles, and milling heads.
- High-Speed Motors and Spindles: Used in applications where rotational accuracy and thermal stability are paramount.
- Precision Robotics: Critical for joints and arms requiring minimal backlash and high positional accuracy.
- Aerospace and Defense Systems: Employed in gyroscopes, radar systems, and other instrumentation demanding the highest levels of reliability and precision.
