71824 ACD/HCP4DBB
Hybrid Ceramic Super Precision Bearings
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71824 ACD/HCP4DBB Bearing Product Overview & Core Advantages
The 71824 ACD/HCP4DBB is a super-precision duplex angular contact ball bearing designed for the most demanding applications. Its primary advantage lies in its back-to-back (DB) duplex arrangement, which provides exceptional rigidity and stability under combined loads (radial and axial). Manufactured to P4 tolerance class and featuring ceramic balls, this bearing is engineered for high-speed operation, reduced friction, and extended service life in precision machinery.
71824 ACD/HCP4DBB Bearing Model Code Explained, Specifications & Naming Convention
- 71824: Basic bearing series, denoting a light-weight, high-precision angular contact design with a 120mm bore.
- AC: Angular Contact design with a 25° contact angle.
- D: Signifies a duplex (two-bearing) set.
- HC: Indicates the use of Hybrid Ceramic balls (silicon nitride).
- P4: Denotes a super-precision tolerance class (ABEC 7 / ISO P4).
- DB: Specifies the Back-to-Back mounting arrangement of the duplex set.
- B: Indicates a Light preload applied to the bearing set.
71824 ACD/HCP4DBB Bearing Structural Features & Performance Benefits
Enhanced Rigidity & Load Capacity: The back-to-back duplex arrangement creates a wide effective spread, significantly increasing moment stiffness and enabling the bearing to handle substantial combined radial and axial loads.
Superior High-Speed Performance: The combination of hybrid ceramic balls (lighter and harder than steel) and a phenolic resin cage reduces centrifugal forces and friction, allowing for a high limiting speed of 16,000 rpm. The 25° contact angle is optimized for high-speed axial load support.
Ultra-Precision Operation: Manufactured to P4 tolerance class with tight dimensional and running accuracy, this bearing ensures minimal vibration and run-out, which is critical for maintaining machining and positioning accuracy.
Pre-Lubricated & Ready-to-Mount: The bearing is supplied lubricated and ready for installation, simplifying the mounting process.
71824 ACD/HCP4DBB Bearing Typical Application Areas
This high-performance bearing is ideally suited for applications requiring extreme precision, high speed, and high rigidity, such as:
- Machine Tool Spindles (e.g., for high-speed milling, grinding, and turning centers)
- Precision Robotic Drives and Rotary Actuators
- High-Frequency Machining Heads
- Aerospace & Defense Instrumentation
- Medical & Dental Equipment Spindles
