71909 ACD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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Materials
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71909 ACD/HCP4ADGA Bearing Product Overview & Core Advantages
The 71909 ACD/HCP4ADGA is a high-precision double row angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This metric bearing features a 25° contact angle and is supplied as a universally matchable (SU) set of two bearings, enabling simplified mounting in preloaded arrangements. Its core advantages include the ability to support combined radial and axial loads simultaneously, superior running accuracy from its P4A tolerance class, and high-speed capability enhanced by a phenolic cage and ceramic balls. This design offers a compact, rigid solution for high-reliability machinery.
Model Code Breakdown
- 71909: Basic series designation for a double row angular contact ball bearing with a 45mm bore.
- ACD: Signifies a 25° contact angle and a specific internal design optimized for universal matching.
- HC: Denotes the use of Hybrid Ceramic components (ceramic balls with steel rings).
- P4A: Indicates a very high precision tolerance class, exceeding ABEC 7/ISO P4 standards.
- A: Specifies an Extra Light preload within the bearing set.
- DGA: Indicates the bearing is supplied as a universally matchable (SU) duplex set.
71909 ACD/HCP4ADGA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The double row design provides high rigidity, effectively supporting combined loads and moment loads. The 25° contact angle is optimized for sustaining significant axial loads in both directions.
High-Speed Performance: The combination of a lightweight phenolic cage and low-density ceramic (hybrid) balls reduces centrifugal forces, enabling a high limiting speed of 41,000 rpm. This makes it an ideal high-speed bearing.
Precision & Longevity: Manufactured to a P4A tolerance class, this bearing ensures minimal runout and vibration for ultra-precise applications. The open seal type allows for customized lubrication schemes to further optimize performance and service life in its specified temperature range.
71909 ACD/HCP4ADGA Bearing Typical Application Areas
This high-precision, high-speed bearing is ideally suited for:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- High-Speed Pumps and Compressors
- Advanced Robotics and Automation Systems
