7021 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
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7021 ACD/HCP4A Bearing Product Overview & Core Advantages
The 7021 ACD/HCP4A is a single-row angular contact ball bearing engineered for applications demanding high precision and superior performance. Its defining characteristic is the 25° contact angle, optimized to handle significant combined loads—simultaneously supporting substantial radial and axial forces. Manufactured to the exacting P4 (ABEC-7) tolerance class, it ensures exceptional running accuracy and rotational stability. The combination of a phenolic cage and ceramic balls contributes to its capability as a high-speed bearing, enabling a limiting speed of 14,000 rpm. This design results in a compact, high-rigidity solution ideal for the most demanding precision machinery.
7021 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7021 | Basic Bearing Series & Size | Denotes a metric series bearing with a 105 mm bore, 160 mm OD, and 26 mm width. |
| AC | Angular Contact | Designed with a contact angle to support combined radial and axial loads. |
| D | High Contact Angle (25°) | Specifies the 25° contact angle, providing enhanced axial load capacity. |
| HCP4A | Internal Design & Precision | Indicates specific internal design features and a P4 (ABEC-7) tolerance class for ultra-high precision. |
7021 ACD/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed & High-Rigidity Performance: The lightweight phenolic cage and low-density ceramic balls significantly reduce centrifugal forces, enabling stable operation at the high limiting speed of 14,000 rpm and increasing overall system rigidity.
- Superior Load Capacity: The 25° contact angle and robust construction provide excellent combined load handling, with a dynamic load rating of 20,340 lbf and a static load rating of 20,925 lbf.
- Ultra-Precision Operation: Manufactured to P4 (ABEC-7) tolerance class with precise bearing dimensions and a preload option, this bearing delivers minimal runout and vibration for critical applications.
- Optimized for Performance: The open seal type allows for custom lubrication schemes to match specific operational needs, while the chrome steel rings ensure durability and long service life.
7021 ACD/HCP4A Bearing Typical Application Areas
This precision angular contact ball bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring extreme accuracy and rigidity.
- High-Frequency Motors & Spindles: Where low vibration and high rotational speeds are critical.
- Precision Robotics: In robotic arm joints and gears demanding high moment stiffness and positional accuracy.
- Aerospace & Defense Systems: In gyroscopes, navigation systems, and other critical components.
