71917 ACD/HCP4ATBTCGMM
Hybrid Ceramic Super Precision Bearings
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71917 ACD/HCP4ATBTCGMM Bearing Product Overview & Core Advantages
The 71917 ACD/HCP4ATBTCGMM is a high-precision angular contact ball bearing supplied as a matched triplex set in a back-to-back (TBT) arrangement. Engineered for superior rigidity and capable of handling combined radial and axial loads, this bearing is defined by its P4A ultra-precision tolerance class and advanced material composition, including ceramic balls and a phenolic cage. It is preloaded and pre-lubricated with grease, making it an ideal, ready-to-install solution for demanding, high-speed applications requiring exceptional accuracy and long-term reliability.
71917 ACD/HCP4ATBTCGMM Bearing Model Code Explained, Specifications & Naming Convention
- 71917: Basic series designation, indicating a high-precision, light-weight angular contact bearing with a 85 mm bore.
- ACD: Angular Contact design with a D (25°) contact angle.
- HC: Hybrid Ceramic, signifying the use of ceramic balls.
- P4A: Ultra-precision tolerance class, exceeding standard ABEC 7 / ISO P4 specifications.
- TBT: Triplex Back-to-Back arrangement of the three matched bearings.
- CG: Cage material is Glass fiber reinforced phenolic resin.
- MM: The bearing is pre-lubricated with a Moderate preload (Class C).
71917 ACD/HCP4ATBTCGMM Bearing Structural Features & Performance Benefits
Exceptional Rigidity and Load Capacity: The triplex back-to-back (TBT) matched arrangement creates an extremely rigid bearing system, capable of supporting high moment loads and complex combined loads. This configuration provides excellent operational stability.
High-Speed & Temperature Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage enables very high limiting speeds (28,000 rpm). The hybrid construction also reduces heat generation and allows for a wider operating temperature range (-30°C to 110°C).
Ultra-Precision Operation: Manufactured to a P4A tolerance class, this bearing ensures minimal runout and vibration, which is critical for applications demanding the highest levels of rotational accuracy.
Ready-to-Install Solution: The set is supplied preloaded and pre-lubricated, simplifying installation and ensuring immediate, optimal performance without the need for initial adjustment.
71917 ACD/HCP4ATBTCGMM Bearing Typical Application Areas
This high-performance bearing is designed for the most demanding precision machinery, including:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Robotics and Automation Arms
- Advanced Medical and Dental Equipment Spindles
- Aerospace Actuators and Control Systems
