71904 ACD/HCP4ATBTA
Hybrid Ceramic Super Precision Bearings
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71904 ACD/HCP4ATBTA Bearing Product Overview & Core Advantages
The 71904 ACD/HCP4ATBTA is a metric, angular contact ball bearing supplied as a triplex matched set in a back-to-back (TBT) arrangement. This configuration is engineered for applications demanding extremely high rigidity and precision. The bearing set features a P4A tolerance class for superior running accuracy, a 25° contact angle for optimal axial load capacity, and ceramic balls that reduce centrifugal forces, enabling higher limiting speeds and operation with minimal lubrication. It is preloaded to an extra light (Class A) specification, making it ideal for high-speed, high-precision spindles where minimal deflection and thermal stability are critical.
Model Code Breakdown
- 71904: Basic bearing series and size designation (Bore: 20mm, OD: 37mm, Width: 27mm).
- ACD: Angular Contact, 25° contact angle.
- HC: Hybrid Ceramic balls (Silicon Nitride).
- P4A: High-Precision Tolerance Class (exceeding ABEC 7).
- TBT: Triplex Back-to-Back matched set arrangement.
- A: Extra Light Preload (Class A).
71904 ACD/HCP4ATBTA Bearing Structural Features & Performance Benefits
Ultra-High Rigidity & Stability: The triplex back-to-back (TBT) arrangement creates a statically determinate system that provides exceptional resistance to moment loads and shaft deflection, ensuring maximum system stiffness.
Enhanced High-Speed Performance: The combination of a lightweight phenolic cage and ceramic (Si3N4) balls significantly reduces rotating mass and centrifugal forces. This allows the bearing set to achieve its high limiting speed of 100,500 rpm with improved stability and reduced heat generation.
Superior Precision and Longevity: Manufactured to a P4A tolerance class, this set guarantees precise running accuracy. The open seal type allows for optimized lubrication management in controlled environments, while the chrome steel rings and ceramic balls offer excellent wear resistance and a long operational life.
71904 ACD/HCP4ATBTA Bearing Typical Application Areas
This high-precision, high-speed bearing set is specifically designed for the most demanding applications, including:
- High-Frequency CNC Machining Spindles
- Precision Grinding Spindles
- High-Speed Dental and Medical Handpiece Drives
- Aerospace and Defense Instrumentation
- Advanced Robotics and Precision Motion Control Systems
