71924 ACE/HCP4ALDT
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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71924 ACE/HCP4ALDT Bearing Product Overview & Core Advantages
The 71924 ACE/HCP4ALDT is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This duplex tandem (DT) arrangement bearing set is preloaded and manufactured to P4A tolerance class, delivering superior running accuracy and system rigidity. Its core advantages include the ability to handle high combined loads (radial and axial), excellent high-speed capability facilitated by a phenolic cage and ceramic balls, and reliable operation within a specified temperature range. This configuration is ideal for creating compact, high-rigidity spindles and shafts.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71924 | Basic bearing series and size designation (Bore: 120mm, OD: 165mm, Width: 44mm). |
| ACE | Internal design code, typically indicating a 25° contact angle and optimized internal geometry. |
| HC | Denotes Hybrid Ceramic construction, featuring steel rings and ceramic balls for reduced friction, higher speed, and longer life. |
| P4A | Specifies the tolerance class, signifying very high precision for bore, outer diameter, and width dimensions, as well as running accuracy. |
| L | Indicates a light preload is applied to the bearing set, increasing system stiffness and rotational accuracy. |
| DT | Specifies the Duplex Tandem arrangement. Two bearings are mounted together to share the load and increase axial load capacity in one direction. |
71924 ACE/HCP4ALDT Bearing Structural Features & Performance Benefits
Hybrid Ceramic Design: The use of ceramic balls (Silicon Nitride) within chrome steel rings significantly reduces centrifugal forces, lowers operating temperature, and enables higher limiting speeds. This construction also offers superior resistance to wear and a longer service life compared to all-steel bearings.
Phenolic Resin Cage: The lightweight and robust phenolic cage provides excellent dimensional stability and guidance for the ceramic balls, contributing to smooth operation and high-speed performance with minimal friction.
Duplex Tandem Preloaded Set: The DT arrangement with a light preload eliminates internal clearance, resulting in greatly enhanced system rigidity and precise rotational guidance. This is critical for applications requiring minimal deflection under load.
High-Precision Manufacturing: Conformance to the P4A tolerance class ensures exceptional dimensional and running accuracy, which is paramount for applications like machine tool spindles to achieve superior finish and positioning repeatability.
71924 ACE/HCP4ALDT Bearing Typical Application Areas
This high-performance bearing set is specifically designed for advanced machinery and systems, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers where precision, rigidity, and speed are critical.
- Precision Robotics: Arm joints and rotary units requiring high accuracy and dynamic response.
- High-Frequency Motors and Spindles: Applications demanding extreme rotational speeds and thermal stability.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
- Medical Equipment: High-speed dental handpieces and imaging device rotors.
