71902 ACD/P4ADBB
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
Product Overview and Core Advantages
The 71902 ACD/P4ADBB is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. This duplex back-to-back (DB) arrangement consists of two matched bearings, preloaded to deliver superior stiffness and precise rotational characteristics. It is engineered to handle combined loads—simultaneous radial and axial loads—with high efficiency. Manufactured to the stringent P4A tolerance class, it ensures minimal runout and vibration, making it ideal for high-speed spindles and other high-precision machinery.
71902 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71902 | Basic bearing designation, indicating a lightweight, high-precision series with a 15mm bore. |
| AC | Angular Contact design with a 25° contact angle, optimized for axial load capacity. |
| D | Indicates a duplex pair of bearings. |
| P4A | Specifies the high-precision tolerance class, exceeding ABEC 7 standards for dimensional and running accuracy. |
| DBB | Defines the specific Back-to-Back (DB) matched arrangement, providing high moment rigidity. |
Structural Features and Performance Benefits
- High Rigidity and Stability: The duplex back-to-back configuration creates a rigid bearing system that effectively resists moment loads and shaft deflection, ensuring exceptional operational stability.
- Superior Load Capacity: The 25° contact angle and optimized internal geometry enable the bearing to support significant combined radial and axial loads simultaneously.
- Optimized for High-Speed Operation: The lightweight phenolic resin cage reduces centrifugal forces, while the light preload (Class B) minimizes friction and heat generation, contributing to a high limiting speed of 95,000 rpm.
- Precision Engineering: Manufactured from high-grade chrome steel for rings and balls, and held to P4A tolerances, this bearing guarantees minimal vibration and precise running accuracy, which is critical for high-speed applications.
71902 ACD/P4ADBB Bearing Typical Application Areas
The 71902 ACD/P4ADBB is ideally suited for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and milling spindles.
- Precision Rotary Systems: High-frequency motors, encoder systems, and measuring instruments.
- Aerospace and Defense: Gyroscopes, navigation systems, and auxiliary power units (APUs).
- Semiconductor Manufacturing: Wafer handling robots and precision stages.
