71904 CD/HCP4ADT
Hybrid Ceramic Super Precision Bearings
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71904 CD/HCP4ADT Bearing Product Overview & Core Advantages
The 71904 CD/HCP4ADT is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This duplex tandem (DT) arrangement bearing set is preloaded and manufactured to P4A tolerance class, ensuring ultra-high running accuracy and system rigidity. Its key advantage lies in its ability to handle high combined loads and achieve superior high-speed performance, making it an ideal choice for high-precision spindles and machinery.
71904 CD/HCP4ADT Bearing Model Code Explained, Specifications & Naming Convention
| 71904 | Basic bearing series and size designation (Bore: 20mm, OD: 37mm, Width: 18mm). |
| C | Specifies a 15° contact angle, optimized for high-speed operation and moderate axial load capacity. |
| D | Indicates a duplex tandem (DT) arrangement, where two bearings are paired to primarily support axial loads in one direction. |
| HC | Signifies the use of Hybrid Ceramic balls, which reduce centrifugal forces, lower operating temperatures, and enable higher limiting speeds. |
| P4A | Denotes an ultra-precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration for critical applications. |
| ADT | Confirms the bearings are supplied as a preloaded duplex tandem set, ready for installation to provide immediate and consistent system stiffness. |
71904 CD/HCP4ADT Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex tandem arrangement and factory-applied preload create an exceptionally rigid bearing system, capable of withstanding significant axial loads in one direction while also supporting radial loads. This configuration is essential for applications requiring minimal axial deflection.
Superior High-Speed Performance: The combination of a lightweight phenolic cage and ceramic balls significantly reduces rotating mass and centrifugal forces. This allows the bearing to operate at a high limiting speed of 75,000 rpm with reduced heat generation and improved dynamic performance.
Precision & Longevity: Manufactured to P4A tolerance class from high-grade chrome steel rings, this bearing guarantees exceptional running accuracy and dimensional stability. The open design, when used with a controlled lubrication system, ensures optimal lubricant flow for extended service life in high-speed applications.
71904 CD/HCP4ADT Bearing Typical Application Areas
The 71904 CD/HCP4ADT is engineered for the most demanding high-speed and high-precision machinery, including:
- Machine Tool Spindles: High-speed milling, drilling, and grinding spindles.
- Precision Instrumentation: Measuring and testing equipment spindles.
- High-Frequency Motors: Spindles for PCB drilling and small motor applications.
- Turbochargers & Compressors: Applications requiring high rotational speeds and reliability.
