71926 ACD/P4AQBCC
71900 Series Super Precision Angular Contact Ball Bearings
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71926 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The 71926 ACD/P4AQBCC is a precision quadruplex angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This matched set of four bearings, arranged in a Back-to-Back (QBC) configuration, is engineered to handle significant combined loads—simultaneously supporting high radial and axial forces. Its P4A tolerance class ensures superior running accuracy, making it ideal for high-precision, high-rigidity, and high-reliability machinery. The moderate preload (Class C) optimizes bearing stiffness and rotational precision right from installation.
71926 ACD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71926 | Basic bearing series and size designation. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a moderate preload (Class C) for enhanced rigidity. |
| /P4A | Indicates a high-precision tolerance class (P4A) for superior running accuracy. |
| QBCC | Denotes a Quadruplex Back-to-Back (QBC) matched set, supplied as a complete, pre-configured assembly of four bearings. |
71926 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
Unmatched Rigidity and Load Capacity: The quadruplex back-to-back arrangement creates an extremely rigid bearing system, capable of withstanding heavy combined radial and axial loads from both directions. This configuration provides exceptional moment stiffness, crucial for maintaining precision under complex loading conditions.
High-Speed Capability: The phenolic cage offers low weight and excellent performance at high speeds, contributing to the bearing's limiting speed of 7,500 rpm. The 25° contact angle is optimized for high axial load capacity while maintaining good high-speed characteristics.
Precision Engineering: Manufactured to P4A tolerance standards with tight dimensional control on the bore diameter, outside diameter, and width, this bearing ensures minimal runout and vibration for smooth, accurate operation.
Durable Construction: Components made from chrome steel provide high hardness and wear resistance, ensuring a long operational life under demanding conditions.
71926 ACD/P4AQBCC Bearing Typical Application Areas
The 71926 ACD/P4AQBCC is specified for high-performance machinery where precision, rigidity, and reliability are paramount. Key application areas include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring extreme accuracy and stiffness.
- Precision Gearboxes: In industrial robotics and high-torque transmission systems.
- High-Frequency Motors and Spindles: Where minimal runout and high rotational speeds are critical.
- Aerospace Test Rigs and Positioning Systems: For applications demanding the highest levels of precision and load capacity.
