71924 CD/P4AQBCC
71900 Series Super Precision Angular Contact Ball Bearings
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71924 CD/P4AQBCC Bearing Product Overview & Core Advantages
The 71924 CD/P4AQBCC is a precision angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This matched quadruplex set in a back-to-back (QBC) arrangement is engineered to handle complex combined loads, including significant radial and axial forces. Manufactured to a P4A tolerance class and featuring a moderate preload (Class C), it delivers superior rotational accuracy, high system stiffness, and reliable performance in demanding, high-precision environments. Its compact design integrates four bearings into a single, highly rigid unit.
71924 CD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
- 71924: Basic model number denoting a metric, angular contact ball bearing with a 120 mm bore, 165 mm OD, and 88 mm width.
- CD: Indicates a duplex bearing with a specific internal design and contact angle (15° in this case), which is the building block for the matched set.
- P4A: Denotes an extremely high precision tolerance class, exceeding ABEC 7/ISO P4 standards, ensuring minimal runout and vibration for ultra-precise applications.
- QBCC: Specifies the matched arrangement.
- Q: Quadruplex set (four bearings).
- BC: Back-to-Back arrangement of the duplex pairs, providing high moment rigidity and stability.
- C: Indicates a moderate preload (Class C) is applied to the set.
71924 CD/P4AQBCC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The quadruplex back-to-back (QBC) arrangement creates an exceptionally rigid bearing system capable of withstanding heavy combined radial and axial loads and moments. The 15° contact angle is optimized for high axial load support while maintaining excellent radial capacity.
Precision Performance: Manufactured to a P4A super-precision tolerance with tight dimensional control on the bore, outside diameter, and width. This guarantees minimal runout, smooth operation, and superior positioning accuracy for spindles and other precision machinery.
High-Speed Capability: The lightweight and robust phenolic resin cage ensures stable operation and reduced centrifugal forces, contributing to a high limiting speed of 10,000 rpm. The bearings are pre-lubricated for immediate startup and optimal performance.
Material & Construction: Made from high-grade chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational life under demanding conditions.
71924 CD/P4AQBCC Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is ideally suited for the most demanding applications, including:
- High-Frequency Machine Tool Spindles (e.g., milling, grinding, and machining centers)
- Precision Grinding Spindles
- High-performance Turbochargers
- Advanced Aerospace & Defense Systems
- Other machinery requiring maximum system stiffness and rotational accuracy.
