71924 ACD/P4ATBTB
71900 Series Super Precision Angular Contact Ball Bearings
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71924 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The 71924 ACD/P4ATBTB is a super-precision angular contact ball bearing designed for the most demanding applications. This metric system bearing is supplied as a triplex back-to-back (TBT) matched set with a light preload (Class B), ensuring exceptional system rigidity and rotational accuracy. Its primary advantages include the ability to handle combined loads (radial and axial), superior running accuracy from its P4A tolerance class, and optimized performance for high-speed operation. The open design and phenolic cage contribute to its high-speed capability, making it an ideal choice for high-precision, high-reliability spindles and machinery.
71924 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
The model number 71924 ACD/P4ATBTB provides detailed technical specifications:
- 71924: Basic bearing series, indicating a 120 mm bore, 165 mm OD, and light series cross-section.
- ACD: Angular Contact design with a 25° contact angle.
- P4A: Denotes an ultra-precision tolerance class exceeding ABEC 7/ISO Class 4, ensuring minimal runout and vibration.
- TBT: Specifies the bearing is part of a Triplex Back-to-Back matched set of three bearings, providing high moment stiffness.
- B: Indicates the Light Preload applied to the matched set, reducing deflection under load for improved rigidity.
71924 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
The 71924 ACD/P4ATBTB's construction delivers distinct performance benefits:
- High Rigidity and Moment Load Capacity: The triplex back-to-back (TBT) arrangement of three bearings creates a highly rigid support system, effectively resisting moment loads and shaft deflection.
- Superior Precision and Smooth Operation: Manufactured to a P4A tolerance class, this bearing guarantees extreme dimensional and running accuracy. The phenolic cage is lightweight, promoting high-speed performance and smooth operation with minimal friction.
- Optimized for Combined Loads: The 25° contact angle is engineered to support significant combined radial and axial loads simultaneously, a critical requirement for machine tool spindles.
- High-Speed Capability: The combination of the open design, precision-ground chrome steel components, and lightweight phenolic cage allows for a high limiting speed, making it suitable for demanding spindle applications.
71924 ACD/P4ATBTB Bearing Typical Application Areas
This high-precision bearing set is engineered for advanced machinery where accuracy, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines, high-frequency motor spindles.
- Robotics: High-accuracy rotary joints and arms.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and other precision instruments.
