71903 CD/PA9ADT
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
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71903 CD/PA9ADT Bearing Product Overview & Core Advantages
The 71903 CD/PA9ADT is a precision angular contact ball bearing designed for demanding applications requiring high rigidity and exceptional running accuracy. As part of a duplex tandem (DT) arrangement, this preloaded bearing set is engineered to handle primarily axial loads in one direction with high stiffness. Its PA9A tolerance class ensures superior dimensional and running accuracy, making it ideal for high-speed spindles and other precision machinery where minimal runout and high positional accuracy are critical.
71903 CD/PA9ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71903 | Bearing series and size code (17mm bore, 30mm OD) | Indicates a high-precision angular contact bearing with specific dimensions. |
| C | 15° contact angle | Optimized for combined loads, favoring axial load capacity. |
| D | Duplex arrangement | Bearing is part of a pre-matched set. |
| PA9A | High precision tolerance class | Guarantees extremely tight dimensional and running accuracy limits. |
| DT | Duplex Tandem | Two bearings are mounted in tandem to increase axial load capacity and rigidity in one direction. |
71903 CD/PA9ADT Bearing Structural Features & Performance Benefits
High Rigidity & Axial Load Capacity: The duplex tandem (DT) arrangement combines two bearings to create a highly rigid assembly capable of supporting significant axial loads. The 15° contact angle is specifically chosen to optimize this axial load carrying capability while still accommodating radial loads.
High-Speed Performance: The use of a lightweight, durable phenolic cage minimizes centrifugal forces, reduces friction, and contributes to the high limiting speed of 121,000 rpm. The open design and factory-applied lubrication ensure optimal performance at these extreme speeds.
Precision Engineering: Manufactured to PA9A tolerance class, this bearing guarantees minimal running and dimensional deviations. This results in superior rotational accuracy, reduced vibration, and enhanced performance in high-precision applications.
Durable Construction: Components made from chrome steel (rings and balls) provide high hardness, wear resistance, and a long operational lifespan under demanding conditions.
71903 CD/PA9ADT Bearing Typical Application Areas
The 71903 CD/PA9ADT is ideally suited for high-performance machinery requiring exceptional precision and speed, including:
- Machine Tool Spindles: High-speed milling, grinding, and drilling spindles.
- Precision Rotary Systems: CNC rotary tables, indexing heads.
- High-Frequency Motors: Spindles for PCB drilling and small precision motors.
- Medical and Dental Equipment: High-speed handpieces and laboratory automation.
- Aerospace Instrumentation: Gyroscopes and other precision navigation components.
