71908 ACD/P4ATGC
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
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71908 ACD/P4ATGC Bearing Product Overview & Core Advantages
The 71908 ACD/P4ATGC is a precision angular contact ball bearing designed for high-performance applications requiring exceptional rotational accuracy and rigidity. Engineered to a P4A tolerance class, it is optimized to handle combined loads (simultaneous radial and axial loads) efficiently. Its universal matchable (SU) design allows for flexible mounting in preloaded sets to achieve maximum system stiffness. The combination of a phenolic cage and a 25° contact angle makes it an excellent choice for high-speed operation and demanding industrial environments.
71908 ACD/P4ATGC Bearing Model Code Explained, Specifications & Naming Convention
- 71908: Basic series number, indicating a light series, 40mm bore angular contact bearing.
- ACD: Designates a 25° contact angle and a specific internal design optimized for high speed and universal matching.
- P4A: Indicates a high-precision tolerance class superior to ABEC 7, ensuring extremely tight dimensional and running accuracy.
- TGC: Specifies the cage material as phenolic (fiberglass reinforced), which contributes to lower friction, reduced weight, and superior performance at high speeds.
71908 ACD/P4ATGC Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The angular contact design and universal matchable (SU) feature enable the bearing to be mounted in preloaded sets (typically 2 or 3 bearings), significantly increasing system rigidity and enabling it to handle substantial combined radial and axial loads.
Superior High-Speed Performance: The lightweight phenolic cage (TGC) minimizes centrifugal forces and ensures stable operation, allowing the bearing to reach a high limiting speed of 41,000 rpm. The optimized internal geometry further enhances high-speed capability.
Precision and Reliability: Manufactured to P4A tolerance class with a moderate preload (Class C), this bearing guarantees minimal runout and consistent performance, which is critical for precision machinery.
71908 ACD/P4ATGC Bearing Typical Application Areas
This bearing is ideally suited for high-precision, high-speed applications, including:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Aerospace Actuation Systems
