71901 CE/HCPA9ADT
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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71901 CE/HCPA9ADT Bearing Product Overview & Core Advantages
The 71901 CE/HCPA9ADT is a precision angular contact ball bearing designed for demanding applications requiring exceptional performance. This duplex tandem (DT) arrangement consists of two bearings preloaded against each other, delivering superior high rigidity and axial load capacity in one direction. Manufactured to an ultra-precise PA9A tolerance class and featuring a phenolic cage and ceramic balls, it is engineered for high-speed operation and extended service life in precision machinery.
Model Code Breakdown
- 71901: Basic bearing series and size designation (12mm bore, 24mm OD).
- CE: Indicates the use of Ceramic balls (typically Silicon Nitride, Si3N4).
- HC: Denotes a Phenolic (Polyamide) cage.
- PA9A: Specifies the tolerance class, indicating extremely tight dimensional and running accuracy.
- DT: Signifies a Duplex Tandem preloaded set of two bearings.
71901 CE/HCPA9ADT Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The duplex tandem arrangement provides maximum stiffness and enables the bearing set to withstand heavy combined loads, primarily high unidirectional axial loads.
Superior High-Speed Performance: The combination of a lightweight phenolic cage and low-density, hard ceramic balls reduces centrifugal forces, allowing for a very high limiting speed of 165,000 rpm. The 15° contact angle is optimized for high-speed axial loads.
Precision and Longevity: Built to the stringent PA9A tolerance class, this bearing ensures minimal runout and vibration. Ceramic balls offer excellent wear resistance, lower friction, and extended service life compared to standard steel balls.
Preload & Temperature Stability: The bearings are supplied as a preloaded set, eliminating internal clearance for precise shaft positioning. The phenolic cage and lubricant are suitable for a wide temperature range from -30°C to 110°C.
71901 CE/HCPA9ADT Bearing Typical Application Areas
This high-precision, high-speed bearing set is ideally suited for applications where extreme accuracy, rigidity, and rotational speed are critical. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling and grinding spindles.
- Precision Robotics: Arm joints and high-performance servo motors.
- Aerospace & Defense Systems: Gyroscopes, navigation instruments, and auxiliary power units.
- Medical Equipment: Dental handpieces and high-speed surgical drills.
