S71924 ACD/P4AQBCA
Sealed Super Precision Angular Contact Ball Bearings
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S71924 ACD/P4AQBCA Bearing Product Overview & Core Advantages
The S71924 ACD/P4AQBCA is a super-precision double row angular contact ball bearing engineered for the most demanding applications. Its core advantage lies in the Quadruplex Back-to-Back (QBC) matched arrangement, which provides exceptional stiffness and stability under complex combined loads (radial and bidirectional axial loads). Manufactured to the stringent P4A tolerance class, this bearing delivers superior running accuracy, making it ideal for high-speed spindles and other high-precision machinery requiring maximum rigidity and reliability in a compact design.
S71924 ACD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| S71924 | Basic Bearing Series & Size | Denotes a 120 mm bore, 165 mm OD double row angular contact ball bearing. |
| ACD | 25° Contact Angle | Optimized for high axial load capacity and high-speed performance. |
| P4A | Tolerance Class | Indicates extra-high precision with tolerances tighter than ABEC 7, ensuring minimal runout and vibration. |
| QBC | Matched Arrangement | Quadruplex (4 bearings) in a Back-to-Back configuration. This setup provides high moment rigidity and is pre-loaded for immediate, precise operation. |
S71924 ACD/P4AQBCA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The double row design and the QBC arrangement work in unison to provide an extremely rigid support system. This structure is exceptionally capable of handling heavy combined loads and moment loads, making the bearing assembly exceptionally stable under operation.
High-Speed Performance: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and smoother operation at the high limiting speed of 11,000 rpm. The 25° contact angle is a balanced design for both speed and axial load capacity.
Precision & Longevity: Manufactured from high-grade chrome steel for both rings and balls, and held to P4A tolerances, this bearing guarantees high running accuracy and extended service life. The bearing is pre-lubricated with grease suitable for a wide temperature range from -30°C to 110°C.
S71924 ACD/P4AQBCA Bearing Typical Application Areas
This super-precision bearing is specifically designed for high-performance applications where utmost accuracy, speed, and rigidity are non-negotiable. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Tables: Indexing and machining tables requiring high positional accuracy.
- High-Frequency Motors & Spindles: Applications demanding minimal vibration at very high rotational speeds.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and other critical navigation systems.
