71926 ACD/P4AQBCA
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71926 ACD/P4AQBCA Bearing Product Overview & Core Advantages
The 71926 ACD/P4AQBCA is a high-precision angular contact ball bearing supplied as a Quadruplex Back-to-Back (QBC) matched set. Engineered to P4A tolerance class, this configuration delivers exceptional rotational accuracy and system rigidity. Its primary advantage lies in its ability to handle combined loads—significant radial and bidirectional axial loads—simultaneously, making it an ideal solution for demanding applications requiring high stiffness, precise shaft positioning, and reliable performance under complex loading conditions.
71926 ACD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71926 | Basic bearing series and size designation | Indicates a metric, single-row angular contact bearing with a 130mm bore, 180mm OD, and 96mm width. |
| AC | Angular Contact design | Optimized geometry for carrying combined loads. |
| D | High Contact Angle (25°) | Provides superior axial load capacity. |
| P4A | Tolerance Class | Denotes high precision with running accuracy superior to ABEC 7/ISO P4. |
| QBC | Quadruplex Back-to-Back | A set of four bearings mounted in a back-to-back arrangement. This creates a highly rigid, moment-load resistant system. |
71926 ACD/P4AQBCA Bearing Structural Features & Performance Benefits
Exceptional Rigidity and Load Capacity: The Quadruplex Back-to-Back (QBC) arrangement is the cornerstone of this bearing's performance. By preloading four bearings together, the set achieves extremely high rigidity, effectively resisting moment loads and preventing shaft deflection under heavy combined loads. This configuration significantly enhances the system's dynamic performance and service life.
Precision and High-Speed Capability: Manufactured to P4A tolerance class, the bearing ensures minimal runout and vibration. The lightweight phenolic cage is ideal for high-speed applications, reducing centrifugal forces and allowing for a limiting speed of 7,500 rpm. The standard lubrication is formulated to perform reliably within the specified temperature range of -30°C to 110°C.
Robust Material Construction: The use of chrome steel for both rings and balls provides high hardness, wear resistance, and a long fatigue life, as evidenced by its high dynamic (51,525 lbf) and static (91,125 lbf) load ratings.
71926 ACD/P4AQBCA Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery where utmost precision, rigidity, and load capacity are non-negotiable. Key applications include:
- High-Precision Machine Tool Spindles: For milling, grinding, and turning centers requiring exceptional accuracy and rigidity.
- High-Speed & High-Rigidity Spindles: Used in applications like PCB drilling and high-speed machining.
- Industrial Pumps and Compressors: Where reliable operation under significant axial and radial loads is critical.
- Precision Rotary Tables and Indexers: Demanding high positional accuracy and moment load resistance.
