71907 CD/P4AQBCA
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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71907 CD/P4AQBCA Bearing Product Overview & Core Advantages
The 71907 CD/P4AQBCA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This metric bearing features a quadruplex back-to-back (QBC) matched arrangement, providing superior stability and the ability to handle combined loads (radial and axial) from multiple directions simultaneously. Manufactured to a P4A tolerance class, it delivers ultra-precise running characteristics, making it ideal for high-speed spindles and other precision machinery where minimal runout and vibration are critical.
71907 CD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71907 | Bearing series and size designation (35mm bore, 55mm OD, 40mm width) |
| C | 15° contact angle |
| D | Enhanced internal design for higher precision and performance |
| P4A | High-precision tolerance class with restricted width tolerance |
| QBC | Quadruplex Back-to-Back matched set of 4 bearings |
71907 CD/P4AQBCA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The quadruplex back-to-back arrangement creates a highly rigid bearing system capable of withstanding complex combined loads, including moment loads. This configuration provides excellent operational stability under demanding conditions.
Precision Performance: Manufactured to P4A tolerance class with extremely tight dimensional tolerances (bore: -0.004mm to 0, OD: -0.004mm to 0), this bearing ensures minimal runout and vibration for high-precision applications.
High-Speed Capability: The phenolic cage and optimized internal geometry contribute to superior high-speed performance, with a limiting speed of 56,000 rpm. The 15° contact angle is optimized for high-speed operation while maintaining good axial load capacity.
Premium Materials: Constructed from chrome steel for both rings and balls, this bearing offers high durability and wear resistance. The phenolic cage provides excellent strength-to-weight ratio and smooth operation at high speeds.
71907 CD/P4AQBCA Bearing Typical Application Areas
The 71907 CD/P4AQBCA is specifically engineered for high-performance applications requiring maximum precision and rigidity:
- Machine tool spindles for grinding, milling, and turning operations
- High-speed machining centers and precision manufacturing equipment
- Precision rotary tables and indexing heads
- Medical equipment spindles and dental machining tools
- Aerospace testing equipment and precision measuring instruments
