71924 ACD/P4AQBCB
71900 Series Super Precision Angular Contact Ball Bearings
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71924 ACD/P4AQBCB Bearing Product Overview & Core Advantages
The 71924 ACD/P4AQBCB is a precision quadruplex angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This P4A tolerance class bearing is configured in a back-to-back (QBC) arrangement, enabling it to withstand combined radial and axial loads from both directions simultaneously. Its compact, pre-matched quadruplex set provides superior stiffness and rotational accuracy, making it ideal for high-precision, high-reliability machinery where minimal deflection is critical.
71924 ACD/P4AQBCB Bearing Model Code Explained, Specifications & Naming Convention
- 71924: Basic bearing series and size designation (Bore: 120mm, OD: 165mm, Width: 88mm).
- ACD: Angular Contact design with a 25° contact angle.
- P4A: Indicates a high-precision tolerance class, exceeding standard ABEC-7/ISO P4 levels for enhanced running accuracy.
- QBC: Denotes a Quadruplex Back-to-Back matched set of four bearings, pre-configured for maximum rigidity.
- Light Preload / Class B: The bearings are supplied with a light preload to eliminate internal clearance, ensuring precise shaft positioning and improved system stiffness.
71924 ACD/P4AQBCB Bearing Structural Features & Performance Benefits
This bearing's performance stems from its specialized construction. The quadruplex back-to-back arrangement creates a very rigid bearing system that effectively resists moment loads and minimizes shaft deflection under complex loading conditions. The 25° contact angle is optimized for carrying significant axial loads in addition to high radial loads (Dynamic: 43,875 lbf, Static: 77,625 lbf). The use of a phenolic resin cage contributes to smooth operation at the bearing's limiting speed of 16,250 rpm, offering low friction and excellent performance in high-speed applications. Manufactured from chrome steel for both rings and balls, it ensures high durability and a long operational life within its specified temperature range of -30°C to 110°C.
71924 ACD/P4AQBCB Bearing Typical Application Areas
The 71924 ACD/P4AQBCB is engineered for the most demanding precision applications, including:
- High-Precision Machine Tool Spindles
- High-Speed Machining Centers
- Precision Grinding Spindles
- Industrial High-Frequency Spindles
- Advanced Robotics and Automation Systems
