71920 ACE/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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71920 ACE/HCP4ADGA Bearing Product Overview & Core Advantages
The 71920 ACE/HCP4ADGA is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This universally matchable (SU) bearing is designed to accommodate combined loads, specifically high axial loads in one direction, while offering superior rotational accuracy. Its core advantages stem from a P4A tolerance class, a ceramic ball and phenolic cage construction, and an extra light preload (Class A), making it ideal for high-speed operation and systems where minimal friction and heat generation are critical.
71920 ACE/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71920 | Basic bearing series and size designation (100mm bore, 140mm OD). |
| ACE | Internal design optimized for high-speed and high-precision performance. |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls for reduced weight, lower friction, and enhanced speed capability. |
| P4A | Tolerance Class: Denotes extremely high dimensional and running accuracy, superior to standard ABEC 7 / ISO P4. |
| DG | Universal Matchable (SU): The bearing is designed to be mounted in pairs (duplex) in a universal matchable arrangement (DB, DF, DT) without selective assembly. |
| A | Preload Class: Indicates an Extra Light preload, minimizing starting and running torque for ultra-high-speed applications. |
71920 ACE/HCP4ADGA Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and extends bearing life, especially at high speeds (up to 15,000 rpm).
Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent dimensional stability and low friction, contributing to smooth operation and high acceleration capability.
High Precision & Rigidity: Manufactured to P4A tolerance class with a 25° contact angle, this bearing provides superior running accuracy, system rigidity, and precise shaft positioning.
Optimized Load Capacity: Engineered to handle significant combined loads, with a high dynamic load rating (13,612 lbf) for long-lasting performance in demanding conditions.
Pre-lubricated & Open Design: The bearing is supplied with lubrication suitable for its operational temperature range (-30°C to 110°C). The open seal type allows for optimal lubrication flow in systems with centralized lubrication.
71920 ACE/HCP4ADGA Bearing Typical Application Areas
This high-precision angular contact ball bearing is ideally suited for applications where speed, accuracy, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy positioning systems.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and auxiliary power units (APUs).
- High-Speed Motors and Drives: Spindles for PCB drilling and dental handpieces.
- Medical Equipment: CT scanners and MRI gantries.
