71924 CD/P4AQFCC
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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71924 CD/P4AQFCC Bearing Product Overview & Core Advantages
The 71924 CD/P4AQFCC is a high-precision quadruplex matched bearing set designed for demanding applications requiring exceptional rotational accuracy and rigidity. This metric angular contact ball bearing configuration features a Face-to-Face (QFC) arrangement, providing superior stability and the ability to withstand combined loads from multiple directions. Manufactured to a P4A tolerance class with a Moderate (Class C) preload, it delivers outstanding running accuracy and is optimized for high-speed operation up to 10,000 rpm. Its compact design integrates four bearings into a single, highly rigid unit, making it ideal for high-performance spindles and precision machinery.
Model Code Breakdown
- 71924: Basic model number denoting a 120 mm bore, 165 mm OD, and 22 mm single bearing width.
- C: Denotes a 15° contact angle, optimized for high-speed applications.
- D: Indicates the bearing has an enhanced internal design for higher performance.
- P4A: Specifies the ultra-precision tolerance class, exceeding ABEC 7/ISO P4 standards for exceptional running accuracy.
- QFC: Stands for Quadruplex Face-to-Face arrangement. This is a matched set of four bearings mounted face-to-face to provide high system rigidity and resistance to moment loads.
71924 CD/P4AQFCC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The Quadruplex Face-to-Face (QFC) arrangement of four bearings creates an extremely stiff bearing system capable of handling significant combined radial and axial loads in both directions, as well as moment loads. This makes the assembly exceptionally resistant to deflection under load.
Precision & High-Speed Performance: Built to P4A tolerance class with a phenolic cage, this set ensures minimal vibration and stable operation at high speeds. The 15° contact angle and moderate preload are specifically chosen to optimize performance for high-speed spindles, contributing to a limiting speed of 10,000 rpm.
Superior Material & Construction: The rings and balls are made from high-grade chrome steel, providing excellent durability and fatigue life. The phenolic cage offers low weight and excellent performance at high rotational speeds.
71924 CD/P4AQFCC Bearing Typical Application Areas
This high-precision matched bearing set is engineered for the most demanding applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: For PCB drilling, semiconductor manufacturing, and other high-accuracy machining processes.
- High-Frequency Motors and other precision rotary equipment requiring maximum rigidity and speed.
