71924 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71924 ACD/HCP4A Bearing Product Overview & Core Advantages
The 71924 ACD/HCP4A is a high-precision angular contact ball bearing engineered for applications demanding exceptional accuracy and performance. This single-row bearing is distinguished by its 25° contact angle and is supplied with a P4 (ABEC-7) tolerance class, ensuring superior running accuracy. Its core advantages include the ability to accommodate combined radial and axial loads simultaneously, high operational stability due to its phenolic resin cage, and excellent high-speed capabilities enabled by its ceramic balls. This bearing is pre-lubricated and available with a preload, making it an ideal, ready-to-install solution for high-rigidity, high-reliability spindle systems.
71924 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71924 | Basic bearing series and size designation. | Defines the core dimensions: 120mm bore, 165mm OD, 22mm width. |
| ACD | 25° Contact Angle, High Precision. | Optimized for high axial load capacity and rigid axial guidance. |
| HC | Hybrid Ceramic (Silicon Nitride balls). | Reduces centrifugal forces, lowers friction, and enables higher limiting speeds. |
| P4 | Tolerance Class (ABEC-7). | Guarantees extremely tight dimensional and running accuracy for precision applications. |
| A | Preload designation. | The bearing is supplied with a specific preload to increase system rigidity and minimize deflection under load. |
71924 ACD/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The use of silicon nitride (ceramic) balls with a chrome steel ring provides significant performance benefits. Ceramic balls are lighter and harder than steel, which reduces centrifugal loading and wear, leading to a higher limiting speed and longer service life.
Phenolic Resin Cage: The phenolic cage offers excellent dimensional stability and low friction at high speeds, contributing to smooth operation and reduced heat generation.
High Rigidity & Load Capacity: The 25° contact angle is optimized to support significant axial loads in one direction while also handling substantial radial loads. The availability of preload further enhances system stiffness, critical for applications requiring high positional accuracy.
Precision Engineering: Manufactured to a P4 tolerance class, this bearing ensures minimal runout and vibration, which is paramount for achieving superior surface finishes and machining accuracy.
71924 ACD/HCP4A Bearing Typical Application Areas
The 71924 ACD/HCP4A is designed for high-performance machinery where precision, speed, and reliability are non-negotiable. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing machines.
- High-Frequency Motors: Spindles for electric motors operating at very high RPMs.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
