71812 CD/P4DBA
71800 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71812 CD/P4DBA Bearing Product Overview & Core Advantages
The 71812 CD/P4DBA is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) matched set provides superior stability when subjected to combined loads (radial and axial). Manufactured to P4 tolerance class, it ensures minimal runout and vibration, making it ideal for high-speed spindles and precision machinery. The extra light preload (Class A) minimizes deflection under light loads while maintaining system stiffness.
Model Code Deep Explanation
| Code Segment | Technical Meaning |
|---|---|
| 71812 | Basic bearing designation (60mm bore, 78mm OD, 20mm width) |
| C | 15° contact angle design |
| D | Duplex bearing arrangement |
| P4 | High precision tolerance class (ABEC 7 equivalent) |
| DB | Back-to-back mounting configuration |
| A | Extra light preload classification |
71812 CD/P4DBA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back arrangement creates a wide effective spread between load centers, significantly enhancing moment stiffness and enabling the bearing to handle substantial combined radial and axial loads simultaneously. The optimized 15° contact angle provides excellent axial load capacity while maintaining good radial performance.
Precision Performance: Manufactured to P4 tolerance class with tight dimensional control (bore/OD tolerance: -0.004mm to 0), this bearing ensures minimal vibration and precise rotational accuracy. The phenolic cage offers excellent dimensional stability and reduced friction, contributing to smooth operation at high speeds (limiting speed: 33,000 rpm).
Material Excellence: Constructed from chrome steel for both rings and balls, providing high hardness, wear resistance, and long service life. The bearing comes pre-lubricated for immediate operation within the specified temperature range (-30°C to 110°C).
71812 CD/P4DBA Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning applications requiring precision and rigidity
- Precision Instrumentation: Measuring equipment, optical devices, and laboratory instruments
- High-Speed Automation: Robotics, CNC machinery, and pick-and-place systems
- Aerospace Components: Gyroscopes, navigation systems, and auxiliary power units
- Medical Equipment: Dental handpieces, surgical tools, and diagnostic imaging systems
