71903 ACD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
Ball & Washer Dimensions
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71903 ACD/P4ADBA Bearing Product Overview & Core Advantages
The 71903 ACD/P4ADBA is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement provides superior stability and can accommodate combined radial and axial loads. Manufactured to P4A tolerance class, it delivers high running accuracy and is ideal for high-speed spindles and other precision machinery where maximum performance and reliability are critical.
71903 ACD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71903 | Basic bearing series and size designation (17mm bore, 30mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates a duplex (two-bearing) set. |
| DB | Specifies the Back-to-Back mounting arrangement for high moment rigidity. |
| P4A | Denotes a high precision tolerance class for running accuracy and dimensional stability. |
71903 ACD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back configuration creates a large effective spread between load centers, significantly increasing the bearing's ability to withstand moment loads and providing exceptional system rigidity. This setup is optimized to handle combined radial and axial loads simultaneously.
Precision & High-Speed Performance: The P4A tolerance class ensures minimal runout and vibration. The phenolic resin cage is lightweight and robust, contributing to smooth operation and a high limiting speed of 103,000 rpm. The 25° contact angle offers an excellent balance between radial and axial load capacity for high-speed applications.
Material & Construction: Manufactured from high-grade chrome steel for both rings and balls, this bearing ensures long-term durability and performance under demanding conditions.
71903 ACD/P4ADBA Bearing Typical Application Areas
This high-precision duplex bearing is ideally suited for:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Rotary Tables and Indexing Heads
- High-Frequency Spindles for PCB drilling and routing
- Medical and Dental Equipment spindles
- Robotic Arm Joints and Precision Gearboxes
