71812 ACD/P4DGB
71800 Series Super Precision Angular Contact Ball Bearings
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71812 ACD/P4DGB Bearing Product Overview & Core Advantages
The 71812 ACD/P4DGB is a super-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a pre-loaded duplex set, it is engineered to handle combined loads—simultaneously supporting significant radial and axial loads in both directions. Its P4 tolerance class ensures ultra-precise dimensions and running accuracy, making it ideal for high-speed spindles and other high-precision machinery. The phenolic cage and optimized 25° contact angle contribute to its outstanding high-speed performance and operational stability.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71812 | Basic bearing series and size designation (60mm bore, 78mm OD, 20mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | The bearing is supplied as a duplex set (two bearings). |
| P4 | Indicates a super-precision tolerance class for exceptional running accuracy. |
| DGB | Duplex arrangement with a Light preload (Class B) applied, ready for installation. |
71812 ACD/P4DGB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex pair configuration provides significantly increased system rigidity, enabling the bearing to handle heavy combined radial and axial loads from both directions with minimal deflection.
- Super-Precision Performance: Manufactured to P4 tolerance standards, this bearing guarantees ultra-low runout and vibration, which is critical for achieving superior surface finishes and machining accuracy.
- Optimized High-Speed Capability: The lightweight phenolic resin cage ensures excellent dimensional stability and low friction at high rotational speeds, supporting a limiting speed of 35,000 rpm. The 25° contact angle offers an ideal balance between axial load capacity and speed.
- Universal Matchability (SU): This design allows any two bearings to be mounted together in a back-to-back (DB), face-to-face (DF), or tandem (DT) arrangement without selective matching, offering exceptional flexibility in machine design and maintenance.
71812 ACD/P4DGB Bearing Typical Application Areas
The 71812 ACD/P4DGB is ideally suited for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing machines.
- High-Frequency Motors: Spindles for CNC machinery.
- Robotics: High-accuracy rotary joints and arm assemblies.
