7021 ACD/P4ATGB
7000 Series Super Precision Angular Contact Ball Bearings
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7021 ACD/P4ATGB Bearing Product Overview & Core Advantages
The 7021 ACD/P4ATGB is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. Operating under the stringent P4A tolerance class, this bearing is engineered to handle combined loads with high reliability. Its Universal Matchable (SU) design allows for flexible mounting in sets of three to achieve optimal preload and system stiffness. With a 25° contact angle and light preload (Class B), it is ideally suited for high-speed spindles and other precision machinery where minimal deflection and superior running accuracy are critical.
7021 ACD/P4ATGB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning | Significance & Advantage |
|---|---|---|
| ACD | Angular Contact, 25° Contact Angle | Optimized for handling significant axial loads in one direction along with radial loads. |
| P4A | High Precision Tolerance Class | Exceeds ABEC 7 standards, ensuring extremely tight dimensional and running accuracy for demanding applications. |
| TGB | Phenolic (Textolite) Cage, Ball Guided | The lightweight phenolic cage contributes to lower inertia and higher limiting speeds, suitable for high-speed operation. |
7021 ACD/P4ATGB Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4A tolerance class with a Universal Matchable (SU) design, this bearing ensures superior system stiffness and running accuracy when mounted in preloaded sets. The precise bearing dimensions (105mm bore, 160mm OD) are held to tight tolerances for reliable performance.
- Optimized Load Capacity: The 25° contact angle is engineered to efficiently support substantial axial loads in combination with radial loads, as evidenced by its high dynamic (44,775 lbf) and static (61,875 lbf) load ratings.
- High-Speed Capability: The lightweight phenolic cage (TGB) reduces centrifugal forces, enabling a high limiting speed of 16,000 rpm. This makes it an excellent high-speed bearing for spindle applications.
- Durable Construction: Components made from chrome steel for both rings and balls ensure high durability and long service life under demanding operating conditions.
7021 ACD/P4ATGB Bearing Typical Application Areas
The 7021 ACD/P4ATGB is a critical component in high-performance machinery requiring precision and speed. Its primary applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications where extreme rotational accuracy is non-negotiable.
- High-Frequency Motors: Spindles for PCB drilling and other high-RPM electric motors.
- Industrial Pumps and Compressors: For shafts requiring precise axial location and high-speed operation.
