71917 ACD/HCP4AQBCC
Hybrid Ceramic Super Precision Bearings
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71917 ACD/HCP4AQBCC Bearing Product Overview & Core Advantages
The 71917 ACD/HCP4AQBCC is a precision quadruplex matched set of angular contact ball bearings, designed for applications demanding exceptional rigidity and accuracy. This metric bearing set features a back-to-back (QBC) arrangement, providing superior stability and the ability to withstand combined loads (radial and axial) from both directions. The use of ceramic balls and a P4A tolerance class ensures high-speed capability, reduced heat generation, and extended service life in high-precision machinery.
71917 ACD/HCP4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
- 71917: Basic series designation, indicating a high-precision, light series angular contact bearing with a 85 mm bore.
- ACD: Angular Contact design with a 25° contact angle.
- HC: Denotes the use of Hybrid Ceramic balls (steel rings with ceramic balls).
- P4A: Specifies a super-precision tolerance class (equivalent to ABEC 7), ensuring extremely tight dimensional and running accuracy.
- QB: Indicates the bearings are universally matched as a Quadruplex Back-to-Back set.
- CC: Specifies a Moderate preload (Class C) applied to the matched set.
71917 ACD/HCP4AQBCC Bearing Structural Features & Performance Benefits
Exceptional Rigidity and Load Capacity: The quadruplex back-to-back arrangement creates a highly rigid bearing system, capable of supporting significant moment loads and combined radial and axial loads. The 25° contact angle is optimized for high axial load capacity.
High-Speed and Thermal Performance: The hybrid ceramic construction (silicon nitride balls) significantly reduces centrifugal forces and friction, allowing for a high limiting speed of 28,000 rpm. This construction also minimizes heat buildup and provides electrical insulation.
Precision and Longevity: Manufactured to P4A super-precision tolerances, this set guarantees smooth, quiet, and vibration-free operation. The phenolic resin cage is lightweight and robust, ideal for high-speed applications. The set is pre-lubricated for immediate use.
71917 ACD/HCP4AQBCC Bearing Typical Application Areas
This high-performance bearing set is engineered for the most demanding applications, including:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Robotic Drives
- Advanced Aerospace and Defense Systems
- Medical and Dental Equipment Spindles
