71905 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
71905 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 71905 ACD/P4ADBB is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. This duplex back-to-back (DB) matched set is preloaded to Light / Class B standards, ensuring high system stiffness and minimal runout. Its primary advantage lies in its ability to handle combined loads efficiently, particularly thrust loads in both directions, making it ideal for high-precision spindles and other critical machinery components where positional accuracy is paramount.
71905 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Basic bearing series and size designation (25mm bore, 42mm OD). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex (Two bearings supplied as a matched set). |
| P4A | High precision tolerance class, equivalent to ABEC 7. |
| DB | Back-to-Back mounting arrangement. |
71905 ACD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back configuration creates a rigid bearing system that can withstand significant combined radial and axial loads. The light preload eliminates internal clearance, enhancing rotational accuracy and stiffness under operational conditions.
Precision Performance: Manufactured to a P4A tolerance class, this bearing ensures extremely tight dimensional and running accuracy, which is critical for applications requiring high-speed and precise positioning.
High-Speed Capability: The phenolic cage is lightweight and robust, contributing to lower centrifugal forces and allowing for a high limiting speed of 103,000 rpm. The 25° contact angle is optimized for high-speed operation with substantial axial load support.
Material & Lubrication: Constructed from chrome steel for both rings and balls, providing high durability and fatigue resistance. The bearing is pre-lubricated for immediate use and reliable operation within its specified temperature range.
71905 ACD/P4ADBB Bearing Typical Application Areas
This high-precision bearing is engineered for advanced machinery where accuracy and speed are critical. Key applications include:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Robotics and Automation Systems
- High-Frequency Spindles for PCB drilling and routing
- Medical Equipment (e.g., Dental handpieces, Laboratory centrifuges)
- Aerospace Instrumentation and Control Systems
