71917 ACE/HCP4A
Hybrid Ceramic Super Precision Bearings
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71917 ACE/HCP4A Bearing Product Overview & Core Advantages
The 71917 ACE/HCP4A is a single-row angular contact ball bearing engineered for applications demanding ultra-high precision and superior high-speed performance. Positioned in the P4 (ABEC-7) tolerance class, it is designed to accommodate primarily axial loads in one direction and combined loads. Its defining features include a ceramic ball and phenolic cage construction, which collectively contribute to lower friction, reduced weight, and the capability to operate at high rotational speeds. This bearing is preloaded, ensuring high system rigidity and precise rotational accuracy from the outset.
71917 ACE/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| 71917 | Basic bearing designation indicating the metric size series (17) and bore diameter (85 mm). |
| ACE | Indicates a 25° contact angle, optimized for handling high axial loads. |
| HC | Signifies the use of Hybrid Ceramic balls (Silicon Nitride), offering advantages in high-speed and high-temperature applications. |
| P4A | Denotes a P4 (ABEC-7) tolerance class with specific internal running accuracy and preload. |
71917 ACE/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Capability: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic resin cage significantly lowers friction and allows for a high limiting speed of 25,000 rpm.
- High Rigidity & Precision: The bearing is supplied with a preload, which eliminates internal clearance. This results in exceptional rigidity and minimal axial/radial runout, making it ideal for precision spindles.
- Superior Load Capacity: The 25° contact angle is optimized to handle significant axial loads in one direction, as well as combined (radial and axial) loads.
- Extended Service Life: Hybrid ceramic construction provides excellent wear resistance and is less susceptible to lubricant degradation, contributing to a longer operational lifespan in demanding conditions.
- Temperature Resilience: Capable of operating within a temperature range of -30°C to 110°C, suitable for various industrial environments.
71917 ACE/HCP4A Bearing Typical Application Areas
The 71917 ACE/HCP4A is specifically designed for high-performance machinery where precision and speed are critical. Its primary applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: High-accuracy robotic arms and joints.
- Aerospace & Defense Systems: Gyroscopes, navigation systems, and auxiliary power units.
- High-Frequency Motors and Spindles: Motors for PCB drilling and dental handpieces.
