71906 CD/P4AQBCC
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71906 CD/P4AQBCC Bearing Product Overview & Core Advantages
The 71906 CD/P4AQBCC is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As part of a Quadruplex Back-to-Back (QBC) matched set, this bearing configuration provides extremely high stiffness and can accommodate combined radial and axial loads from both directions. Manufactured to the stringent P4A tolerance class, it is engineered for high-speed operation and superior performance in precision machinery.
71906 CD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
| 71906 | Bearing series and size designation (30mm bore, 47mm OD) |
| CD | Contact angle of 15° |
| P4A | High-precision tolerance class for superior running accuracy |
| QBCC | Quadruplex Back-to-Back (QBC) matched set with Moderate preload (Class C) |
71906 CD/P4AQBCC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The Quadruplex Back-to-Back arrangement creates an exceptionally stiff bearing system capable of withstanding heavy combined loads and moments. With a radial dynamic load rating of 4185 lbf and radial static load rating of 4118 lbf, it delivers reliable performance under demanding conditions.
High-Speed Performance: Featuring a phenolic cage and optimized internal geometry, this bearing achieves a limiting speed of 100,500 rpm, making it suitable for high-speed spindle applications.
Precision Engineering: Manufactured to P4A tolerance standards with tight dimensional control (bore and OD tolerance: -0.004mm to 0), this bearing ensures minimal runout and vibration for precision applications.
Material Quality: Constructed from chrome steel for both rings and balls, providing excellent wear resistance and durability across the operating temperature range of -30°C to 110°C.
71906 CD/P4AQBCC Bearing Typical Application Areas
The 71906 CD/P4AQBCC is ideally suited for high-precision, high-speed applications including:
- Machine tool spindles and high-speed machining centers
- Precision grinding spindles requiring extreme accuracy
- High-frequency spindle motors and dental handpieces
- Industrial robotics and automation equipment
- Aerospace positioning systems and instrumentation
