7021 CD/P4ADBC
7000 Series Super Precision Angular Contact Ball Bearings
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7021 CD/P4ADBC Bearing Product Overview & Core Advantages
The 7021 CD/P4ADBC is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched arrangement of two bearings in a back-to-back (DB) configuration provides superior stability and is capable of supporting combined loads (radial and axial) simultaneously. Manufactured to a P4A tolerance class and featuring a moderate preload (Class C), it delivers high running accuracy and is optimized for high-speed operation up to 16,000 rpm. Its robust construction makes it ideal for demanding, high-precision machinery.
7021 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7021 | Basic bearing designation indicating a 105 mm bore, 160 mm OD, and 52 mm width. |
| C | Specifies a 15° contact angle, optimized for supporting combined loads. |
| D | Indicates the bearing is part of a duplex (matched) set. |
| P4A | Denotes a high precision tolerance class, ensuring minimal dimensional runout and superior running accuracy. |
| DB | Specifies the back-to-back mounting arrangement, which provides high moment rigidity and stability. |
| C (in Preload) | Indicates a moderate preload, which increases bearing rigidity and minimizes axial and radial play under operational conditions. |
7021 CD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The duplex back-to-back (DB) design creates a wide effective spread between load centers, significantly increasing the bearing's resistance to moment loads and enhancing overall system stiffness.
Superior Load Capacity: With a 15° contact angle and a dynamic load rating of 35,100 lbf, this bearing is engineered to handle significant combined radial and axial loads efficiently.
Optimized High-Speed Performance: The combination of a lightweight phenolic resin cage, precision P4A tolerances, and a moderate preload allows for smooth operation at the limiting speed of 16,000 rpm, reducing friction and heat generation.
Precision Engineering: Manufactured from chrome steel for both rings and balls, and held to strict dimensional tolerances, this bearing ensures consistent, high-accuracy performance in the most demanding applications.
7021 CD/P4ADBC Bearing Typical Application Areas
This high-precision duplex bearing is ideally suited for applications where exceptional accuracy, rigidity, and speed are paramount. Key industries and machinery include:
- Machine Tool Spindles (e.g., for milling, grinding, and turning centers)
- High-Frequency Motors and Spindles
- Precision Gearboxes and Transmission Systems
- Industrial Pumps and Compressors
- Robotic Arm Joints and Precision Positioning Systems
