71907 ACD/P4AQBCA
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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71907 ACD/P4AQBCA Bearing Product Overview & Core Advantages
The 71907 ACD/P4AQBCA is a precision angular contact ball bearing configured in a Quadruplex Back-to-Back (QBC) matched set. Engineered to the exacting P4A tolerance class, it delivers exceptional rotational accuracy and dimensional stability. Its primary advantage lies in its ability to handle combined loads—significant radial and axial loads in both directions—simultaneously, making it ideal for applications demanding high rigidity and precise shaft guidance. The matched set ensures optimized preload and uniform load distribution, enhancing overall system performance and longevity.
71907 ACD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71907 | Basic bearing series and size designation (35mm bore, 55mm OD, 40mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a duplex pair (two bearings mounted together). |
| /P4A | Indicates a high-precision tolerance class (P4A), superior to ABEC-7. |
| QBC | Specifies the matched arrangement: Quadruplex Back-to-Back (a set of four bearings in a back-to-back configuration). |
71907 ACD/P4AQBCA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The Quadruplex Back-to-Back (QBC) arrangement creates a highly rigid bearing system that effectively resists moment loads and supports heavy combined loads. The 25° contact angle is optimized for sustaining substantial axial loads.
- Precision & Speed: Manufactured to P4A tolerance standards with a phenolic cage, this bearing ensures smooth operation, minimal vibration, and a high limiting speed of 56,000 rpm, suitable for high-speed applications.
- Superior Material & Construction: Made from chrome steel for both rings and balls, it offers high durability and fatigue resistance. The open design, pre-lubricated from the factory, allows for optimal lubrication management in the application.
- Matched Set Performance: The set of four bearings is supplied with a controlled Extra light (Class A) preload, ensuring immediate operational readiness, simplified installation, and consistent, predictable performance.
71907 ACD/P4AQBCA Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is ideally suited for demanding applications, including:
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Gearboxes
- High-Frequency Motors and Spindles
- Industrial Pumps and Compressors
- Aerospace Actuation Systems
