7021 ACDGA/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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7021 ACDGA/P4A Bearing Product Overview & Core Advantages
The 7021 ACDGA/P4A is a super-precision angular contact ball bearing designed for applications demanding the highest levels of accuracy and performance. As a single bearing with a 25° contact angle and Extra Light (Class A) preload, it is engineered to provide exceptional rotational accuracy, high rigidity, and reliable operation under combined radial and axial loads. Manufactured to the stringent P4A tolerance class, this bearing is ideal for high-speed spindles and other precision machinery where minimal runout and consistent performance are critical.
7021 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Interpretation | Technical Significance |
|---|---|---|
| 7021 | Basic Bearing Series | Denotes a metric series angular contact ball bearing with a 105mm bore, 160mm OD, and 26mm width. |
| AC | Angular Contact | The bearing is designed to support combined loads, with the contact angle optimized for axial load capacity. |
| D | Two-piece phenolic cage (in some manufacturer coding) | Indicates a lightweight, high-strength phenolic resin cage, contributing to lower friction and higher limiting speeds. |
| GA | Universal Matchable (SU) | Specifies that the bearing is "Universal Matchable." When mounted in a set (e.g., 3 bearings), they can be arranged to achieve a specific preload and stiffness without selective assembly. |
| P4A | Tolerance Class | Defines a super-precision tolerance class with extremely tight limits on bore, outside diameter, and width tolerances for superior running accuracy. |
7021 ACDGA/P4A Bearing Structural Features & Performance Benefits
High Precision and Rigidity: The P4A tolerance class ensures minimal dimensional variation, leading to superior running accuracy and system rigidity. The 25° contact angle provides an excellent balance between radial and axial load capacity.
Optimized for High-Speed Operation: The lightweight phenolic cage reduces centrifugal forces, while the open seal type minimizes friction, collectively enabling a high limiting speed of 16,000 rpm. The bearing is supplied lubricated for immediate operation.
Superior Load Capacity: With a dynamic load rating of 20,340 lbf and a static load rating of 20,925 lbf, this bearing is capable of handling significant combined loads in demanding applications.
Universal Matching Design: The GA (Universal Matchable) designation allows for simplified mounting of multiple bearings in a stack (e.g., DB or DF arrangements) to achieve precise preload and system stiffness without the need for selective grinding or complex calculations.
7021 ACDGA/P4A Bearing Typical Application Areas
The 7021 ACDGA/P4A is ideally suited for high-performance machinery where precision, speed, and reliability are non-negotiable. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: For PCB drilling, semiconductor manufacturing, and other high-accuracy processes.
- High-Frequency Motors: Where low vibration and high rotational accuracy are required.
- Robotics: Critical joints and actuators demanding high rigidity and precision.
