71930 ACD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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71930 ACD/P4A Bearing Product Overview & Core Advantages
The 71930 ACD/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. Engineered to a P4 (ABEC-7) tolerance class, this bearing excels in high-speed scenarios, with a limiting speed of 8,500 rpm. Its 25° contact angle is optimized to support significant combined loads—handling both radial and axial forces simultaneously. The phenolic resin cage ensures smooth operation at high velocities, while the preloaded, single arrangement guarantees consistent performance and minimal deflection under load, making it an ideal choice for high-rigidity, high-reliability systems.
71930 ACD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71930 | Basic bearing series and size designation (150mm bore, 210mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a high internal capacity design. |
| P4 | Indicates a P4 precision tolerance class (equivalent to ABEC-7), ensuring ultra-high running accuracy. |
| A | Denotes a specific internal geometry and preload level for optimal rigidity. |
71930 ACD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The angular contact design and preload provide superior stiffness, enabling the bearing to handle high combined loads with minimal deformation. With a dynamic load rating of 24,300 lbf and static load rating of 28,125 lbf, it offers robust performance in demanding conditions.
- High-Speed Performance: The lightweight phenolic cage and optimized internal geometry contribute to low friction and heat generation, allowing stable operation up to the limiting speed of 8,500 rpm.
- Precision Engineering: Manufactured to P4 tolerance class, this bearing guarantees exceptional dimensional accuracy and run-out control, which is critical for applications requiring high rotational precision.
- Material Quality: Constructed from chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational lifespan.
71930 ACD/P4A Bearing Typical Application Areas
- Machine Tool Spindles
- High-Speed Robotic Drives
- Precision Grinding Spindles
- Medical and Dental Equipment
- Aerospace Actuation Systems
