71920 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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71920 ACD/HCP4A Bearing Product Overview & Core Advantages
The 71920 ACD/HCP4A is a high-precision angular contact ball bearing engineered for applications demanding exceptional rotational accuracy and rigidity. As a single-row bearing, it is optimized to support combined loads, carrying significant radial loads and axial loads in one direction simultaneously. Its defining features include a P4 (ABEC-7) tolerance class for superior running accuracy, a 25° contact angle for high axial load capacity, and the availability of preload for enhanced system stiffness. The use of a ceramic ball and phenolic cage combination contributes to its high-speed capabilities, low heat generation, and extended service life, making it an ideal choice for high-performance, high-reliability machinery.
71920 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71920 | Standard bearing series designation, indicating the bearing dimensions (100mm bore, 140mm OD, 20mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a high internal capacity design. |
| HC | Hybrid Ceramic: Indicates the use of ceramic balls (typically Silicon Nitride). |
| P4 | Specifies the precision tolerance class (P4 / ABEC-7). |
| A | Indicates that the bearing is supplied with a specific preload. |
71920 ACD/HCP4A Bearing Structural Features & Performance Benefits
High Rigidity and Precision: Manufactured to a P4 tolerance class, this bearing ensures minimal runout and vibration, which is critical for precision applications. The availability of preload eliminates internal clearance, resulting in a significant increase in system stiffness and precise shaft positioning.
Enhanced Load Capacity: The 25° contact angle is optimized to handle substantial combined loads, providing excellent performance where high radial and one-direction axial loads are present.
Superior High-Speed Performance: The hybrid ceramic design with ceramic balls and a lightweight phenolic cage reduces centrifugal forces, lowers operating temperature, and allows for a higher limiting speed. This makes it a true high-speed bearing.
Durability and Long Life: Ceramic balls are harder, lighter, and more resistant to wear and corrosion than steel balls. They also provide electrical insulation. The phenolic cage offers high strength and smooth operation at high speeds, contributing to the bearing's overall reliability and longevity.
71920 ACD/HCP4A Bearing Typical Application Areas
The 71920 ACD/HCP4A is specifically designed for high-end, demanding applications across various industries, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers where precision and rigidity are paramount.
- High-Frequency Motors and Spindles: Used in applications requiring extreme rotational speeds and low vibration.
- Precision Robotics: In robot arm joints and gears that require high accuracy and dynamic response.
- Aerospace and Defense Systems: For gyroscopes, navigation systems, and other critical components.
- Medical Equipment: In high-speed dental handpieces and imaging device rotors.
