71905 ACD/P4AQBCB
71900 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
Ball & Washer Dimensions
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71905 ACD/P4AQBCB Bearing Product Overview & Core Advantages
The 71905 ACD/P4AQBCB is a super-precision angular contact ball bearing designed for the most demanding high-speed and high-rigidity applications. As part of a Quadruplex Back-to-Back (QBC) matched set, this bearing is engineered to provide exceptional stability and accuracy under combined loads. Its P4A tolerance class ensures ultra-precise running, making it ideal for machine tool spindles and other high-performance machinery where minimal runout and maximum rigidity are critical.
71905 ACD/P4AQBCB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing designation (25mm bore, 42mm OD, 36mm width) |
| ACD | Angular Contact design with a 25° contact angle |
| P4A | Super-precision tolerance class (exceeds ABEC 7/ISO P4 standards) |
| QBC | Quadruplex Back-to-Back arrangement for maximum rigidity |
| B | Light preload class for optimal performance in high-speed applications |
71905 ACD/P4AQBCB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The Quadruplex Back-to-Back arrangement creates an extremely rigid bearing system capable of withstanding heavy combined radial and axial loads from both directions. This configuration provides superior moment stiffness, essential for maintaining precision under cutting forces.
High-Speed Performance: Featuring a phenolic resin cage and optimized internal geometry, this bearing achieves exceptional limiting speeds up to 53,000 rpm. The lightweight cage reduces centrifugal forces, while the precision-ground balls ensure smooth operation at high rotational velocities.
Precision Engineering: Manufactured to P4A tolerance class with bore and outside diameter tolerances of -0.004mm to 0, this bearing delivers unmatched running accuracy. The 25° contact angle provides an optimal balance between axial and radial load capacity for spindle applications.
Material Excellence: Constructed from chrome steel for both rings and balls, the bearing offers high fatigue resistance and dimensional stability. The phenolic cage provides excellent strength-to-weight ratio and operates effectively within the specified temperature range of -30°C to 110°C.
71905 ACD/P4AQBCB Bearing Typical Application Areas
The 71905 ACD/P4AQBCB is specifically designed for high-precision, high-speed applications including:
- Machine Tool Spindles - CNC machining centers, grinding spindles
- High-Speed Motors - Precision electric motors and generators
- Aerospace Components - Gyroscopes, navigation systems
- Medical Equipment - Dental handpieces, surgical tools
- Precision Instrumentation - Measuring devices, optical equipment
