71902 ACD/P4ADT
71900 Series Super Precision Angular Contact Ball Bearings
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71902 ACD/P4ADT Bearing Product Overview & Core Advantages
The 71902 ACD/P4ADT is a precision angular contact ball bearing configured as a duplex tandem (DT) pair. This matched set is preloaded and designed to deliver exceptional high-speed performance and high rigidity. Its primary advantage lies in its ability to handle significant axial loads in one direction while maintaining superior rotational accuracy, making it ideal for demanding applications requiring precise shaft positioning and minimal deflection under load.
71902 ACD/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71902 | Basic bearing series and size designation. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates a duplex (two-bearing) set. |
| P4A | Denotes a high-precision tolerance class, exceeding standard ABEC 7/ISO P4 levels for enhanced running accuracy. |
| DT | Specifies the Duplex Tandem arrangement, where two bearings are matched to share axial loads in the same direction, increasing axial load capacity. |
71902 ACD/P4ADT Bearing Structural Features & Performance Benefits
High Rigidity & Axial Load Capacity: The duplex tandem (DT) arrangement and 25° contact angle create a highly rigid system capable of supporting heavy axial loads in one direction, making it suitable for preloaded systems.
High-Speed Capability: The lightweight phenolic resin cage minimizes centrifugal forces, contributing to the high limiting speed of 95,000 rpm. The open design allows for efficient lubrication management.
Precision Performance: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration, which is critical for applications demanding high rotational accuracy.
Durable Construction: Components made from chrome steel provide high fatigue life and wear resistance, ensuring long-term reliability under demanding operating conditions.
71902 ACD/P4ADT Bearing Typical Application Areas
The 71902 ACD/P4ADT is engineered for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Spindles in PCB drilling and routing equipment
- High-Frequency Motors and Encoder Systems
- Medical Equipment and Dental Handpieces
- Aerospace Actuation Systems
