S71909 ACE/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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S71909 ACE/HCP4ADBA Bearing Product Overview & Core Advantages
The S71909 ACE/HCP4ADBA is a high-precision duplex back-to-back angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched pair bearing set features a P4A super-precision tolerance class and is preloaded for immediate, stable performance. Its core advantage lies in its ability to handle combined radial and axial loads simultaneously with high rigidity, making it ideal for high-speed spindles and other precision machinery where rotational accuracy is paramount. The use of ceramic balls and a phenolic cage further enhances its high-speed capability and reduces rotational mass.
S71909 ACE/HCP4ADBA Bearing Model Code Explained, Specifications & Naming Convention
- S7: High-precision angular contact ball bearing series.
- 1909: Standard size designation (Bore: 45 mm, OD: 68 mm, Width: 12 mm per bearing).
- ACE: Specific internal design and clearance for duplex mounting.
- HC: Hybrid Ceramic construction (Steel rings with Ceramic balls).
- P4A: Super-precision tolerance class, tighter than ABEC 7/ISO P4.
- A: Denotes a specific contact angle of 25°.
- DB: Duplex Back-to-Back arrangement, providing high moment rigidity.
S71909 ACE/HCP4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a rigid bearing system that effectively resists moment loads and supports combined loads. The 25° contact angle is optimized for sustaining significant axial loads in both directions.
Superior High-Speed Performance: The combination of lightweight phenolic resin cage and hybrid ceramic balls (silicon nitride) significantly reduces centrifugal forces and friction, enabling a high limiting speed of 41,000 rpm. Ceramic balls also offer superior resistance to thermal expansion.
Precision & Longevity: Manufactured to a P4A tolerance class, this bearing ensures minimal runout and vibration for ultra-precise applications. The sealed design retains factory-fill grease and protects against contamination, ensuring consistent performance and extended service life.
S71909 ACE/HCP4ADBA Bearing Typical Application Areas
This high-precision duplex bearing is ideally suited for applications requiring maximum rotational accuracy and stiffness, including:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Grinding Spindles
- High-Frequency Motors
- Robotic Drives and Servo Motors
- Aerospace & Defense Instrumentation
