71917 ACD/P4ADGB
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 71917 ACD/P4ADGB is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a preloaded pair, it is engineered to handle combined loads efficiently, supporting significant radial and axial loads simultaneously. Its P4A tolerance class and light preload (Class B) ensure smooth, high-precision operation, making it ideal for high-speed spindles and other precision machinery where minimal runout and high system rigidity are critical.
71917 ACD/P4ADGB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | 25° Contact Angle and optimized internal design for high axial load capacity. |
| P4A | High precision tolerance class exceeding ABEC 7, ensuring minimal dimensional and running accuracy deviations. |
| DGB | Indicates a Universal Matchable (SU) pair, supplied as two bearings with faces ground to achieve a specific preload when mounted together. |
Structural Features and Performance Benefits
High Rigidity and Load Capacity: The 25° contact angle and optimized internal geometry enable the bearing to support substantial combined radial and axial loads. When mounted as a universal matchable pair with light preload, the system stiffness is significantly increased, reducing deflection under load.
High-Speed Performance: The phenolic cage is lightweight and robust, contributing to lower centrifugal forces and enabling a high limiting speed of 28,000 rpm. This makes the bearing suitable for high-speed applications.
Precision Operation: Manufactured to P4A tolerance class with tight dimensional controls on the bore diameter, outside diameter, and width, this bearing guarantees exceptional running accuracy and low vibration levels.
Material and Lubrication: Constructed from chrome steel for both rings and balls, the bearing offers high durability and wear resistance. It is supplied lubricated for immediate use, operating effectively within a temperature range of -30°C to 110°C.
71917 ACD/P4ADGB Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers.
- High-Speed Machining Centers: Where rapid feed rates and high rotational speeds are required.
- Precision Grinding Spindles: Applications demanding extreme accuracy and smooth operation.
- Industrial Pumps and Compressors: For handling axial and radial loads in rotary systems.
