S71924 ACD/P4AQBTC
Sealed Super Precision Angular Contact Ball Bearings
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Main Dimensions
Ball & Washer Dimensions
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S71924 ACD/P4AQBTC Bearing Product Overview & Core Advantages
The S71924 ACD/P4AQBTC is a precision angular contact ball bearing designed for the most demanding applications. Its defining feature is its Quadruplex Tandem Back-to-Back (QBT) matched arrangement, providing exceptional axial rigidity and the capacity to handle significant combined loads. Manufactured to the stringent P4A tolerance class, this bearing delivers superior running accuracy and is optimized for high-speed operation, making it an ideal choice for high-precision, high-reliability machinery.
S71924 ACD/P4AQBTC Bearing Model Code Explained, Specifications & Naming Convention
- S71924: Basic model number, indicating a 120 mm bore diameter and a specific internal design.
- ACD: Angular Contact, 25° contact angle design.
- P4A: Tolerance class specifying very high precision for both dimensional and running accuracy.
- QBT: Quadruplex Tandem Back-to-Back arrangement. This denotes a pre-matched set of four bearings configured to provide maximum axial stiffness.
- C: Moderate preload (Class C), which is applied to the bearing set to enhance rigidity and minimize deflection under load.
S71924 ACD/P4AQBTC Bearing Structural Features & Performance Benefits
Unmatched Rigidity and Load Capacity: The Quadruplex Tandem Back-to-Back (QBT) arrangement is the cornerstone of this bearing's performance. This configuration creates an extremely rigid system capable of withstanding heavy combined radial and axial loads from both directions, making it exceptionally stable under complex loading conditions.
High-Speed Performance: The use of a lightweight, durable phenolic resin cage reduces centrifugal forces, while the optimized internal geometry and 25° contact angle contribute to a high limiting speed of 11,000 rpm. The P4A precision ensures smooth, low-vibration operation at these speeds.
Pre-Configured for Reliability: As a factory-matched set, the four bearings are selectively assembled to ensure optimal load sharing and performance. The moderate preload (Class C) is pre-applied, eliminating the need for complex on-site adjustment and guaranteeing immediate, consistent performance upon installation.
S71924 ACD/P4AQBTC Bearing Typical Application Areas
This high-precision, high-rigidity bearing is engineered for advanced industrial machinery, including:
- High-Speed Machine Tool Spindles
- Precision Grinding Spindles
- High-Performance Pumps and Compressors
- Aerospace and Defense Positioning Systems
