71907 ACD/P4AQBCB
71900 Series Super Precision Angular Contact Ball Bearings
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71907 ACD/P4AQBCB Bearing Product Overview & Core Advantages
The 71907 ACD/P4AQBCB is a high-precision quadruplex angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This P4A tolerance class bearing features a back-to-back quadruplex arrangement (QBC), providing superior stability and high rigidity under complex loading conditions. Its light preload (Class B) ensures precise rotational accuracy while minimizing friction, making it ideal for high-speed spindle applications where uncompromising performance is required.
71907 ACD/P4AQBCB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71907 | Basic bearing series with 35mm bore, 55mm OD, 40mm width |
| ACD | Angular Contact Design with 25° contact angle |
| P4A | High precision tolerance class (superior to ABEC 7) |
| QBC | Quadruplex Back-to-Back matched arrangement |
| B | Light preload classification |
71907 ACD/P4AQBCB Bearing Structural Features & Performance Benefits
Enhanced Rigidity & Load Capacity: The quadruplex back-to-back configuration creates an extremely rigid bearing system capable of withstanding combined radial and axial loads from multiple directions. This arrangement provides superior moment stiffness, essential for precision machining applications.
High-Speed Performance: Featuring a phenolic resin cage that offers excellent strength-to-weight ratio and minimal friction, enabling stable operation at limiting speeds up to 56,000 rpm. The optimized 25° contact angle balances axial and radial load capacity while maintaining high-speed capability.
Precision Engineering: Manufactured to P4A tolerance standards with tight dimensional control (bore/OD tolerance: -0.004mm to 0), ensuring consistent performance and interchangeability. The 21 chrome steel balls with 5.556mm diameter provide smooth operation and extended service life.
Thermal Stability: The phenolic cage material maintains dimensional stability across the operating temperature range of -30°C to 110°C, while the factory lubrication ensures immediate operational readiness.
71907 ACD/P4AQBCB Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers requiring extreme rigidity
- High-Speed Machining Centers: Applications demanding both high rotational speeds and accuracy
- Precision Instrumentation: Medical equipment, measuring devices, and optical systems
- Robotics & Automation: High-precision robotic arms and automated manufacturing equipment
- Aerospace Components: Guidance systems and aircraft instrumentation requiring reliable performance
