7021 ACD/P4ADBB
7000 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 7021 ACD/P4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This matched back-to-back arrangement (DB) is preloaded to Light / Class B standards, delivering superior rotational precision and stability. Engineered to handle combined radial and axial loads simultaneously, its compact design makes it ideal for high-precision machinery where space optimization and high rigidity are critical. Manufactured to P4A tolerance class, it guarantees exceptional running accuracy for demanding applications.
7021 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
- 7021: Basic designation indicating a 105 mm bore and 160 mm outside diameter.
- AC: Angular Contact design with a 25° contact angle.
- D: Signifies a Duplex (two-bearing) set.
- P4A: Denotes an ultra-precision tolerance class for superior running accuracy.
- DB: Indicates the Back-to-Back mounting arrangement, which provides high moment rigidity.
- B: Specifies the Light preload level (Class B).
Structural Features and Performance Benefits
The bearing's performance is derived from its specific construction. The duplex back-to-back configuration significantly increases system rigidity and effectively resists moment loads. The phenolic resin cage ensures quiet operation and is suitable for high-speed applications, contributing to the bearing's limiting speed of 16,000 rpm. The specified 25° contact angle provides an optimal balance between radial and axial load capacity. With a dynamic load rating of 33,300 lbf and a static load rating of 41,850 lbf, it is built for demanding duty cycles. The bearings are supplied pre-lubricated and ready for installation.
7021 ACD/P4ADBB Bearing Typical Application Areas
This high-precision bearing is ideally suited for applications where accuracy and stiffness are paramount. Typical uses include:
- Machine Tool Spindles
- High-Speed Machining Centers
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Robotic Arm Joints and Rotary Tables
