71913 ACE/HCP4AH1DBA
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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71913 ACE/HCP4AH1DBA Bearing Product Overview & Core Advantages
The 71913 ACE/HCP4AH1DBA is a duplex pair of super-precision angular contact ball bearings, designed for the most demanding applications. This P4A tolerance class matched set in a Back-to-Back (DB) arrangement delivers exceptional rotational accuracy, high system rigidity, and superior running performance. Its core advantages include the ability to accommodate combined loads (radial and axial), high-speed capability enabled by a phenolic cage and ceramic balls, and outstanding operational stability for critical spindle and machine tool applications.
Model Code Breakdown
| 71913 | Basic bearing series and size designation (65mm bore, 90mm OD, 26mm width). |
| ACE | A: 25° contact angle. C: Ceramic balls (Silicon Nitride). E: Optimized internal geometry for high-speed operation. |
| HC | High-Capacity phenolic (resin) cage material. |
| P4A | Tolerance class exceeding ABEC 7/ISO P4, with specific running accuracy requirements. |
| H1 | Identifies a specific preload group within the Extra light preload category. |
| DB | Duplex Back-to-Back mounting arrangement. |
| A | Identifies the specific preload level as Extra light / Class A. |
71913 ACE/HCP4AH1DBA Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The duplex Back-to-Back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and provides excellent stability. This configuration allows the bearing set to handle significant combined radial and axial loads from both directions.
Superior High-Speed Performance: The combination of ceramic balls and a phenolic cage is critical for high-speed operation. Ceramic balls are lighter, reducing centrifugal forces, while the phenolic cage offers excellent strength-to-weight ratio and smooth running characteristics, contributing to the high limiting speed of 36,000 rpm.
Precision and Thermal Stability: Manufactured to P4A tolerance class with a 25° contact angle, this bearing ensures minimal runout and precise shaft positioning. The ceramic balls also exhibit lower thermal expansion compared to steel, enhancing dimensional stability across the operating temperature range.
71913 ACE/HCP4AH1DBA Bearing Typical Application Areas
This high-performance bearing set is engineered for precision machinery requiring the highest levels of speed and accuracy. Typical applications include:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Grinding Spindles
- High-frequency Main Motor Spindles
- Other high-performance rotational systems in aerospace and semiconductor manufacturing equipment.
