71912 ACD/P4AQGB
71900 Series Super Precision Angular Contact Ball Bearings
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71912 ACD/P4AQGB Bearing Product Overview & Core Advantages
The 71912 ACD/P4AQGB is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As part of a universally matchable (SU) set, this bearing is engineered to accommodate combined loads—significant radial and axial loads in one direction—simultaneously. Its P4A tolerance class ensures ultra-precision operation, making it ideal for high-speed spindles and other precision machinery where minimal runout and high system rigidity are critical. The light preload (Class B) minimizes deflection under operational forces, enhancing performance and longevity.
71912 ACD/P4AQGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71912 | Standard bearing series number, indicating the bearing dimensions (60mm bore, 85mm OD, 52mm width). |
| AC | Angular Contact design with a 25° contact angle, optimized for high axial load capacity. |
| D | Signifies a high-precision variant with enhanced manufacturing tolerances. |
| P4A | Indicates an ultra-precision tolerance class, superior to ABEC-7, for applications requiring extreme running accuracy. |
| QGB | Specifies a universally matchable (SU) bearing, part of a set of 4 bearings that can be mounted in any combination to achieve various preload and stiffness configurations. |
71912 ACD/P4AQGB Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The single-row angular contact design, combined with a 25° contact angle and light preload, provides high resistance to operational deflection, ensuring excellent system stability and the ability to handle significant combined loads.
High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to the high limiting speed of 33,000 rpm. This makes it suitable for high-speed applications like machine tool spindles.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on bore, outside diameter, and width, this bearing guarantees precise shaft positioning and smooth, quiet operation.
Optimized Internal Geometry: With 24 precision chrome steel balls of 7.938 mm diameter, the bearing is engineered for low friction, high dynamic load rating (11,115 lbf), and long service life.
71912 ACD/P4AQGB Bearing Typical Application Areas
The 71912 ACD/P4AQGB is ideally suited for high-performance machinery where precision, speed, and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Articulated arms and high-accuracy positioning systems.
- High-Frequency Motors and Spindles: Applications requiring minimal vibration at extreme rotational speeds.
- Medical Equipment: High-speed dental handpieces and imaging device rotors.
- Aerospace Actuation Systems: Control surface mechanisms and auxiliary power units.
