7020 ACD/P4ADBB
7000 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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7020 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 7020 ACD/P4ADBB is a precision duplex pair of Angular Contact Ball Bearings in a Back-to-Back (DB) arrangement. This configuration is engineered to provide exceptional high rigidity and the ability to withstand combined loads, including significant radial loads and axial loads in both directions. Manufactured to the stringent P4A tolerance class, it delivers superior running accuracy, making it ideal for high-performance, high-reliability applications where precise shaft positioning and stability are critical. The matched set is pre-lubricated and features a light preload (Class B) for immediate, optimized performance.
7020 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
- 7020: Basic designation denoting a 100 mm bore and 150 mm outside diameter.
- ACD: Signifies Angular Contact design with a 25° contact angle.
- P4A: Indicates a high-precision tolerance class for both inner and outer rings, ensuring minimal runout and vibration.
- DB: Denotes the Duplex Back-to-Back matched arrangement, which provides high moment rigidity.
- Open / Lubricated: The bearing is supplied with lubrication but features an open (non-shielded) design, allowing for customized lubrication regimes in demanding applications.
7020 ACD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a wide, stable support system that significantly increases moment stiffness. This structure is exceptionally effective at handling combined radial and axial loads from both directions simultaneously.
Precision & High-Speed Performance: Built to P4A tolerance standards with a phenolic resin cage, this bearing ensures smooth operation, reduced friction, and excellent suitability for high-speed applications up to 15,000 rpm.
Optimized Internal Geometry: The 25° contact angle provides an optimal balance between axial and radial load capacity. The use of 22 high-grade chrome steel balls of 15.875 mm diameter ensures high dynamic (28,575 lbf) and static (36,000 lbf) load ratings.
Material Integrity: Constructed from chrome steel for both rings and balls, the bearing offers high hardness, wear resistance, and a long operational life within a temperature range of -30°C to 110°C.
7020 ACD/P4ADBB Bearing Typical Application Areas
This high-precision, high-rigidity bearing pair is designed for demanding applications, including:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Robotic Arms and Precision Gearboxes
