71903 ACD/P4ADGC
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71903 ACD/P4ADGC Bearing Product Overview & Core Advantages
The 71903 ACD/P4ADGC is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a universally matchable (SU) bearing supplied in a pre-set duplex pair, it is engineered to accommodate combined loads—simultaneously handling significant radial and axial forces. Its P4A tolerance class and moderate preload (Class C) ensure high running accuracy and stable performance in high-speed and high-precision environments. The phenolic cage and optimized internal geometry contribute to its superior performance, making it an ideal choice for machine tool spindles and other precision equipment.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71903 | Basic bearing designation: 17 mm bore, 30 mm OD, 14 mm width. |
| AC | Angular Contact design with a 25° contact angle. |
| D | The bearing is a duplex pair, pre-configured for universal matching (SU). |
| P4A | High-Precision Tolerance Class, specifying extremely tight dimensional and running accuracy. |
| DGC | Indicates a specific preload level (Moderate / Class C) applied to the duplex set. |
71903 ACD/P4ADGC Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex arrangement and 25° contact angle provide superior rigidity, enabling the bearing to withstand combined radial and axial loads effectively. This makes it exceptionally stable under complex loading conditions.
- Precision & High-Speed Performance: Manufactured to P4A tolerance class with a phenolic resin cage, this bearing ensures minimal vibration and excellent performance at limiting speeds up to 121,000 rpm. The universal matchable (SU) design allows for flexible mounting configurations (back-to-back, face-to-face, or tandem) to optimize stiffness and thermal expansion management.
- Optimized for Precision Applications: The moderate preload (Class C) eliminates internal clearance, enhancing shaft positioning accuracy and system rigidity without generating excessive heat. The open design allows for custom lubrication schemes to suit specific operational needs.
71903 ACD/P4ADGC Bearing Typical Application Areas
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Spindles: In PCB drilling, semiconductor manufacturing, and other high-accuracy processes.
- High-Frequency Motors: Where minimal runout and high rotational accuracy are required.
- Medical and Laboratory Equipment: Such as centrifuges and precision scanners.
