S71917 ACE/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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S71917 ACE/HCP4ADBA Bearing Product Overview & Core Advantages
The S71917 ACE/HCP4ADBA is a precision duplex angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This matched set features a back-to-back (DB) arrangement and is manufactured to a P4A tolerance class, delivering superior running accuracy and dimensional stability. Its core advantages include the ability to withstand combined loads (radial and axial) simultaneously, high operational rigidity due to its duplex configuration, and excellent high-speed capability facilitated by its ceramic balls and phenolic cage. Preloaded with grease, this sealed unit offers reliable, long-term performance in precision machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| S71917 | Basic bearing designation, indicating a 85 mm bore, 120 mm OD, and 36 mm width. |
| ACE | Internal design code, typically relating to contact angle and internal geometry optimization. |
| HC | Hybrid Ceramic: Denotes the use of ceramic balls for reduced friction, higher speed, and longer life. |
| P4A | High-Precision Tolerance Class, specifying very tight dimensional and running accuracy tolerances. |
| DB | Duplex Back-to-Back arrangement. This configuration provides high moment rigidity and is optimal for withstanding overturning moments. |
| A | Extra Light Preload. This preload level ensures minimal deflection and smooth, precise operation under light loads. |
S71917 ACE/HCP4ADBA Bearing Structural Features & Performance Benefits
High Rigidity and Stability: The duplex back-to-back (DB) arrangement creates a rigid bearing system that effectively resists moment loads and shaft misalignment, ensuring precise shaft positioning and high rigidity.
Superior Load Capacity: With a 25° contact angle, this bearing is optimized to handle significant combined radial and axial loads simultaneously, making it suitable for complex loading conditions.
Enhanced High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage allows for a limiting speed of 28,000 rpm, reducing friction and heat generation at high velocities.
Precision and Longevity: Manufactured to P4A tolerance class with a sealed design and pre-lubrication, this bearing delivers consistent, high-accuracy performance and extended service life by protecting against contamination and retaining lubricant.
S71917 ACE/HCP4ADBA Bearing Typical Application Areas
The S71917 ACE/HCP4ADBA is ideally suited for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Robotics: In robotic arm joints and gears requiring high positional accuracy.
- High-Frequency Motors and Spindles: Used in PCB drilling spindles and dental handpieces.
- Aerospace and Defense Systems: In gyroscopes, navigation systems, and auxiliary power units.
- Medical and Laboratory Equipment: For centrifuges and high-speed imaging devices.
