71812 CD/P4DFA
71800 Series Super Precision Angular Contact Ball Bearings
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71812 CD/P4DFA Bearing Product Overview & Core Advantages
The 71812 CD/P4DFA is a precision duplex pair of angular contact ball bearings arranged in a Face-to-Face (DF) configuration. This matched set is designed for applications requiring extremely high running accuracy and superior rigidity. The bearings are manufactured to P4 tolerance class and feature an Extra Light (A) preload, making them ideal for high-speed spindles and other precision machinery where minimal deflection and exceptional rotational accuracy are critical. Their ability to accommodate combined radial and axial loads from both directions makes them a versatile and reliable solution.
71812 CD/P4DFA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Interpretation | Technical Significance |
|---|---|---|
| 71812 | Basic Bearing Series & Size | Denotes a high-precision, light series bearing with a 60 mm bore, 78 mm OD, and 20 mm width. |
| C | 15° Contact Angle | Optimized for high-speed operation and capable of handling significant axial loads. |
| D | Duplex Bearing | Indicates two bearings are supplied as a matched pair. |
| P4 | Tolerance Class | Signifies super-precision tolerances for exceptional running accuracy and minimal vibration. |
| DF | Face-to-Face Arrangement | The bearings are mounted with their faces together. This arrangement provides high rigidity and is tolerant to misalignment. |
| A | Preload | Specifies an Extra Light preload, which minimizes friction and heat generation, enabling higher limiting speeds. |
71812 CD/P4DFA Bearing Structural Features & Performance Benefits
- Superior Rigidity & Accuracy: The duplex DF arrangement creates a highly rigid bearing system that effectively resists moment loads. Combined with the P4 precision grade, this ensures exceptional rotational stability and positioning accuracy.
- Optimized for High Speeds: The 15° contact angle and Extra Light preload (A) are specifically chosen to reduce centrifugal forces and internal friction, allowing the bearing to achieve its high limiting speed of 33,000 rpm.
- High-Quality Materials: The use of chrome steel for rings and balls ensures high durability and fatigue life. The phenolic resin cage is lightweight and robust, contributing to smooth operation at high speeds.
- Pre-Lubricated: The bearings come lubricated from the factory, ready for immediate installation and initial operation within the specified temperature range.
71812 CD/P4DFA Bearing Typical Application Areas
The 71812 CD/P4DFA is engineered for the most demanding precision applications, including:
- High-Frequency Machine Tool Spindles (e.g., for milling, grinding, and drilling)
- Precision Grinding Spindles
- High-speed Robotic Arm Drives
- Medical Equipment such as dental handpieces and small centrifuges
- Aerospace Instrumentation and navigation systems
