7021 ACD/P4ADGA
7000 Series Super Precision Angular Contact Ball Bearings
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7021 ACD/P4ADGA Bearing Product Overview & Core Advantages
The 7021 ACD/P4ADGA is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Manufactured to P4A tolerance class, this bearing excels in high-speed and high-precision environments. Its universal matchable (SU) design allows for flexible mounting in pairs to support combined loads, including significant radial and axial loads in both directions. The extra light preload (Class A) ensures smooth, quiet operation with minimal starting torque, making it ideal for machine tool spindles and other precision machinery where reliability is paramount.
7021 ACD/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Contact Angle of 25° and Universal Matchable (SU) design for paired mounting. |
| P4A | High precision tolerance class with enhanced running accuracy for spindle applications. |
| DGA | Indicates a phenolic cage and the bearing is lubricated from the factory. |
7021 ACD/P4ADGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The optimized internal geometry with a 25° contact angle and dual-row design provides superior stiffness, enabling the bearing to handle substantial combined radial and axial loads simultaneously.
- High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, contributing to a high limiting speed of 16,000 rpm. This makes it a true high-speed bearing for demanding applications.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on the bore diameter (105 mm), outside diameter (160 mm), and width (52 mm), ensuring consistent, high-accuracy performance.
- Optimized Internal Design: Features 21 high-grade chrome steel balls with a diameter of 17.462 mm, precisely arranged to maximize load distribution and service life.
7021 ACD/P4ADGA Bearing Typical Application Areas
This precision angular contact ball bearing is engineered for high-performance applications, including:
- Machine Tool Spindles (milling, grinding, and turning centers)
- High-Frequency Motors and Precision Gearboxes
- Industrial Pumps and Compressors
- Aerospace Positioning Systems and Robotic Arms
