71918 ACB/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
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71918 ACB/HCP4A Bearing Product Overview & Core Advantages
The 71918 ACB/HCP4A is a high-precision single row angular contact ball bearing engineered for applications demanding exceptional rotational accuracy and high-speed performance. Its defining characteristic is the 25° contact angle and P4 (ABEC-7) tolerance class, ensuring minimal runout and superior stability. The bearing is preloaded, eliminating internal clearance for enhanced rigidity and precise shaft positioning. A key performance advantage is the use of a phenolic resin cage and ceramic balls, which significantly reduce centrifugal forces, lower operating temperatures, and enable higher limiting speeds. This combination makes it an ideal solution for machine tool spindles and other high-precision, high-velocity machinery.
71918 ACB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
- 71918: Basic bearing series and size designation (90mm bore, 125mm OD, 18mm width).
- ACB: Signifies Angular Contact Bearing with a 25° contact angle.
- H: Indicates the bearing is supplied preloaded for high rigidity.
- C: Denotes the use of Ceramic (Si3N4) balls for high-speed and longevity.
- P4A: Specifies the P4 (ABEC-7) tolerance class, representing ultra-precision manufacturing standards.
71918 ACB/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Capability: The combination of a lightweight phenolic cage and low-density ceramic balls drastically reduces inertial forces, allowing the bearing to achieve a high limiting speed of 22,000 rpm.
- High Rigidity and Precision: The bearing is supplied with a preload, which increases system stiffness, improves rotational accuracy, and dampens vibrations, making it suitable for high-precision applications.
- Extended Service Life: Ceramic balls are harder, lighter, and more corrosion-resistant than steel, leading to reduced wear, lower friction, and longer operational life, especially in demanding conditions.
- Superior Accuracy: Manufactured to P4 tolerance class, this bearing guarantees tight dimensional and running accuracy, which is critical for applications like machine tool spindles.
71918 ACB/HCP4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy positioning systems.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and auxiliary power units.
- High-Frequency Spindles: PCB drilling and semiconductor manufacturing equipment.
