7020 ACD/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
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7020 ACD/HCP4ADBA Bearing Product Overview & Core Advantages
The 7020 ACD/HCP4ADBA is a duplex pair of precision angular contact ball bearings designed for the most demanding applications. This matched set, arranged in a Back-to-Back (DB) configuration, is engineered to handle combined loads—simultaneously supporting high radial loads and substantial axial loads in both directions. Its extra light preload (Class A) and P4A super-precision tolerance ensure exceptional running accuracy, high rigidity, and smooth operation at very high speeds, making it ideal for high-performance spindles and other precision machinery.
7020 ACD/HCP4ADBA Bearing Model Code Explained, Specifications & Naming Convention
- 7020: Basic series code, indicating a 100mm bore and 150mm outside diameter.
- A: Denotes a 25° contact angle, optimized for carrying high axial loads.
- CD: Signifies a duplex pair with universal matching for a specific preload.
- HC: Indicates the use of Hybrid Ceramic balls (Silicon Nitride).
- P4A: Defines the tolerance class, signifying super-precision levels for high accuracy and speed.
- DB: Specifies the Back-to-Back mounting arrangement, providing high moment rigidity.
- A: Confirms the extra light preload classification.
7020 ACD/HCP4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex Back-to-Back (DB) arrangement creates a highly rigid bearing system that effectively resists moment loads and tilting, providing stable shaft support. The 25° contact angle is optimally designed to handle significant combined radial and axial loads.
High-Speed Performance: The combination of a lightweight phenolic resin cage, hybrid ceramic balls (which reduce centrifugal force and friction), and factory-applied lubrication enables a very high limiting speed of 21,000 rpm. This makes the bearing suitable for high-speed spindle applications.
Precision & Longevity: Manufactured to P4A super-precision tolerances, this bearing ensures minimal runout and vibration. The open seal design is complemented by pre-lubrication, facilitating optimal performance in controlled environments and reducing maintenance needs.
7020 ACD/HCP4ADBA Bearing Typical Application Areas
This high-precision, high-speed bearing pair is typically used in:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Grinding Spindles
- High-Frequency Motors
- Industrial Pumps and Compressors
- Aerospace & Defense Instrumentation
