71917 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
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71917 CD/HCP4A Bearing Product Overview & Core Advantages
The 71917 CD/HCP4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and high-speed performance. Its defining characteristic is the 15° contact angle, which is optimized to support significant combined loads—handling both radial and axial forces simultaneously. Manufactured to a P4 (ABEC-7) tolerance class, this bearing guarantees minimal runout and superior dimensional stability. The use of a phenolic cage and ceramic balls significantly reduces friction and inertial mass, enabling higher limiting speeds and enhanced durability. It is pre-lubricated for immediate use and is available with a preload for applications demanding maximum rigidity and precise shaft positioning.
71917 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
- 71917: The basic bearing series and size designation (85mm bore, 120mm OD, 18mm width).
- C: Denotes a 15° contact angle.
- D: Indicates that the bearing is supplied with a specific preload for high rigidity.
- HC: Signifies the use of Hybrid Ceramic components (ceramic balls with steel rings).
- P4: Represents the tolerance class P4 (ABEC-7), indicating ultra-precision manufacturing standards.
- A: Specifies a 30° contact angle (Note: This appears to be a conflict with the 'C' designation for 15°. In practice, the 'C' typically takes precedence for a 15° angle. Please verify the exact specification with technical documentation).
71917 CD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The single-row angular contact design, combined with a P4 tolerance class, provides exceptional running accuracy and stiffness, which is crucial for the precise positioning of spindles.
- Superior High-Speed Capability: The hybrid ceramic construction (ceramic balls) and lightweight phenolic cage drastically reduce centrifugal forces and operating temperatures, allowing the bearing to achieve a high limiting speed of 20,000 rpm.
- Enhanced Load Capacity: The 15° contact angle is optimally designed to handle combined radial and axial loads efficiently, with a dynamic load rating of 10,395 lbf and a static load rating of 10,800 lbf.
- Reduced Maintenance & Long Service Life: The open seal type allows for optimal lubrication flow and heat dissipation, while the ceramic balls offer superior resistance to wear and a longer operational lifespan, especially in demanding environments.
71917 CD/HCP4A Bearing Typical Application Areas
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Robotics: In arm joints and high-accuracy actuators.
- High-Frequency Motors and Spindles: Used in PCB drilling and dental handpieces.
- Aerospace and Defense Systems: In gyroscopes, navigation systems, and auxiliary power units.
