71804 CD/HCP4DBA
Hybrid Ceramic Super Precision Bearings
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71804 CD/HCP4DBA Bearing Product Overview & Core Advantages
The 71804 CD/HCP4DBA is a precision angular contact ball bearing designed for applications demanding exceptional accuracy and performance. This duplex back-to-back (DB) matched set is preloaded to Extra Light (Class A) standards, delivering superior running accuracy and high rigidity. Its compact design, featuring a 20 mm bore and 32 mm outside diameter, is engineered to handle combined radial and axial loads simultaneously, making it an ideal solution for high-speed, high-precision machinery where stability and reliability are paramount.
71804 CD/HCP4DBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71804 | Basic bearing series, indicating a metric, angular contact design with a 20mm bore and 32mm outside diameter. |
| CD | Indicates a Duplex Back-to-Back (DB) arrangement. This configuration provides high moment rigidity and is optimal for withstanding overturning moments. |
| HC | Signifies the use of Hybrid Ceramic components, specifically ceramic balls, which reduce weight, friction, and heat generation, enabling higher speeds. |
| P4 | Denotes a high-precision tolerance class (P4), ensuring extremely tight dimensional and running accuracy for demanding applications. |
| DB | Reinforces the Duplex Back-to-Back matched set designation. |
| A | Specifies the preload level as Extra Light (Class A), which minimizes friction and heat while maintaining high rigidity. |
71804 CD/HCP4DBA Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls (Si3N4) significantly reduces centrifugal forces, lowers operating temperatures, and extends service life, especially in high-speed applications.
Duplex Back-to-Back (DB) Design: This matched pair configuration creates a rigid bearing system that can withstand combined loads and substantial moment loads, ensuring exceptional shaft positioning accuracy and system stability.
Phenolic Resin Cage: The lightweight and robust phenolic cage offers excellent guidance for the ceramic balls, contributing to smooth operation, low vibration, and high limiting speeds (121,000 rpm).
Precision P4 Tolerances: Manufactured to P4 tolerance class, this bearing guarantees minimal runout and precise dimensional control, which is critical for applications requiring ultra-high running accuracy.
Extra Light Preload (Class A): The preloaded set eliminates internal clearance, enhancing stiffness and rotational accuracy without introducing excessive friction or heat generation.
71804 CD/HCP4DBA Bearing Typical Application Areas
The 71804 CD/HCP4DBA is engineered for the most demanding high-precision and high-speed environments. Its key application areas include:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Robotic Drives and Actuators
- Aerospace and Defense Instrumentation
- Medical and Dental High-Speed Handpieces
- Semiconductor Manufacturing Equipment
