7020 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
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7020 ACD/HCP4A Bearing Product Overview & Core Advantages
The 7020 ACD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional rotational accuracy and rigidity. This single-row bearing is distinguished by its 25° contact angle and is supplied with a preload, ensuring minimal axial and radial play for superior system stability. Manufactured to a P4 (ABEC-7) tolerance class, it guarantees extremely tight dimensional and running accuracy. The combination of a ceramic ball and phenolic cage enables outstanding high-speed performance, with a limiting speed of 15,000 rpm, while the open design allows for customized lubrication schemes to optimize service life.
7020 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7020 | Standard bore diameter (100 mm) and dimension series | Defines the core bearing size and geometry. |
| AC | Angular Contact design | Optimized to support combined radial and axial loads simultaneously. |
| D | High Contact Angle (25°) | Provides higher axial load capacity and rigidity. |
| HCP4A | P4A Tolerance Class with Preload | Indicates ultra-precision manufacturing (P4/ABEC-7) and a specific axial preload grade for high running accuracy and stiffness. |
7020 ACD/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Design: The use of ceramic balls significantly reduces weight, centrifugal forces, and friction, enabling higher limiting speeds and reduced operating temperatures compared to all-steel designs. Ceramic's inherent properties also enhance resistance to wear and electrical arcing.
- Phenolic Resin Cage: This lightweight and robust cage material offers excellent dimensional stability and low friction at high speeds, contributing to the bearing's overall high-speed capability and smooth operation.
- Precision & Preload: The P4 tolerance and factory-applied preload eliminate internal clearance, resulting in exceptional rotational accuracy, high system rigidity, and precise shaft positioning, which is critical for minimizing vibration and runout.
- High Load Capacity: The 25° contact angle and optimized internal geometry provide a robust dynamic load rating of 17,842 lbf and a static load rating of 18,000 lbf, making it suitable for applications with significant combined loads.
7020 ACD/HCP4A Bearing Typical Application Areas
The 7020 ACD/HCP4A is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key sectors include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC milling machines.
- Precision Robotics: Arm joints and rotary actuators requiring high positional accuracy and stiffness.
- Aerospace & Defense: Gyroscopes, radar systems, and auxiliary power units (APUs).
- High-Speed Motors and Drives: Electric motors, spindles for PCB drilling, and compressor shafts.
