7021 ACD/HCP4ATBTA
Hybrid Ceramic Super Precision Bearings
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7021 ACD/HCP4ATBTA Bearing Product Overview & Core Advantages
The 7021 ACD/HCP4ATBTA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and speed capabilities. This triplex matched set features three bearings arranged in a Back-to-Back (TBT) configuration, providing superior moment stiffness and the ability to handle combined loads (radial and axial) simultaneously. Manufactured to P4A tolerance class with a 25° contact angle and ceramic balls, it delivers outstanding rotational accuracy, low heat generation, and extended service life in high-performance machinery.
7021 ACD/HCP4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle. |
| HC | Hybrid Ceramic, indicating the use of ceramic balls. |
| P4A | High-Precision Tolerance Class (superior to ABEC 7). |
| TBT | Triplex Back-to-Back matched set arrangement. |
| A | Extra Light Preload. |
7021 ACD/HCP4ATBTA Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Load Capacity: The triplex back-to-back arrangement creates a highly rigid bearing system capable of withstanding heavy combined loads and significant moment loads, making it ideal for applications where shaft deflection must be minimized.
- High-Speed Performance: The combination of a lightweight phenolic cage, hybrid ceramic balls (silicon nitride), and an extra light preload significantly reduces centrifugal forces and friction, enabling a high limiting speed of 16,250 rpm.
- Precision and Longevity: Manufactured to P4A tolerance standards with a 25° contact angle for optimal axial load capacity. The ceramic balls are electrically insulating, reduce wear, and offer superior performance in high-temperature or lubricant-starved conditions.
- Optimized for Precision Mounting: The set comes pre-lubricated and features strict dimensional tolerances on the bore diameter, outside diameter, and width for precise, predictable installation in high-accuracy assemblies.
7021 ACD/HCP4ATBTA Bearing Typical Application Areas
This precision bearing set is engineered for the most demanding applications across various industries, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace & Defense: Gyroscopes, radar systems, and flight control mechanisms.
- Medical Equipment: High-speed dental handpieces and imaging device rotors.
- Semiconductor Manufacturing: Wafer handling robots and precision stages.
