71807 CD/P4QBCB
71800 Series Super Precision Angular Contact Ball Bearings
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71807 CD/P4QBCB Bearing Product Overview & Core Advantages
The 71807 CD/P4QBCB 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 is engineered to handle combined loads—significant radial and axial loads in both directions—simultaneously. Its P4 tolerance class ensures ultra-precision operation, making it ideal for high-speed spindles and other critical machinery where high rigidity and minimal runout are paramount. The pre-lubricated design and light preload (Class B) facilitate immediate installation and optimal performance from startup.
71807 CD/P4QBCB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71807 | Basic bearing series and size designation (35mm bore, 47mm OD). |
| CD | Indicates a 15° contact angle, optimized for high-speed operation and radial load capacity. |
| P4 | Denotes a high-precision tolerance class with extremely tight dimensional and running accuracy limits. |
| QBC | Specifies the bearing is one of four in a Quadruplex Back-to-Back (QBC) matched arrangement. |
| B | Indicates the specific light preload (Class B) applied to the set for enhanced stiffness. |
71807 CD/P4QBCB Bearing Structural Features & Performance Benefits
- Superior Rigidity and Load Capacity: The Quadruplex Back-to-Back (QBC) arrangement creates an extremely rigid bearing system capable of withstanding heavy combined loads and moments. The 15° contact angle provides an excellent balance between radial and axial load carrying capacity.
- High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to the high limiting speed of 56,000 rpm. This makes it a true high-speed bearing.
- Precision Engineering: Manufactured to P4 tolerance class standards, this bearing guarantees minimal runout and vibration, which is critical for applications requiring high positional accuracy and smooth operation.
- Optimized Material Selection: Constructed from chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational lifespan under demanding conditions.
71807 CD/P4QBCB Bearing Typical Application Areas
This high-precision, high-rigidity bearing is specifically designed for advanced applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Rotary Systems: Industrial robots, CNC indexing heads, and rotary tables.
- High-Frequency Motors and Spindles: Where minimal vibration and high running accuracy are required.
- Advanced Medical and Laboratory Equipment: Such as high-speed centrifuges.
