71812 ACD/P4DGC
71800 Series Super Precision Angular Contact Ball Bearings
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71812 ACD/P4DGC Bearing Product Overview & Core Advantages
The 71812 ACD/P4DGC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in pre-lubricated pairs, it delivers superior performance in handling combined radial and axial loads. Manufactured to P4 tolerance class with a 25° contact angle and moderate preload (Class C), this bearing is engineered for high-speed operation, excellent running accuracy, and long-term reliability in precision machinery.
71812 ACD/P4DGC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71812 | Basic bearing designation indicating size series 71 and bore diameter 60mm |
| AC | Angular Contact design with 25° contact angle |
| D | Two bearings in universal matchable arrangement (SU) |
| P4 | High precision tolerance class for superior running accuracy |
| DGC | Moderate preload (Class C) for optimal stiffness and performance |
71812 ACD/P4DGC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The angular contact design with 25° contact angle enables efficient handling of combined radial and axial loads. The universal matching (SU) arrangement allows bearings to be mounted in various configurations (back-to-back, face-to-face, or tandem) to optimize system stiffness and load distribution.
Precision Performance: Manufactured to P4 tolerance class with tight dimensional control (bore and OD tolerance: -0.004mm to 0), ensuring exceptional running accuracy and minimal vibration. The moderate preload (Class C) eliminates internal clearance, providing consistent performance and enhanced system rigidity.
High-Speed Capability: Features a phenolic cage that reduces centrifugal forces and friction, enabling operation at limiting speeds up to 35,000 rpm. The optimized internal geometry and 28 high-precision chrome steel balls ensure smooth rotation and thermal stability.
Pre-lubricated Design: Factory-lubricated for immediate operation, reducing maintenance requirements and ensuring optimal performance throughout the temperature range of -30°C to 110°C.
71812 ACD/P4DGC Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers, grinding spindles, and CNC milling machines
- High-Speed Motors: Electric spindle motors, high-frequency motors, and servo drives
- Precision Instruments: Measuring equipment, optical instruments, and laboratory apparatus
- Aerospace Components: Gyroscopes, navigation systems, and aircraft instrumentation
- Medical Equipment: Dental handpieces, surgical tools, and diagnostic imaging systems
