S7008 ACD/P4ADBB
Sealed Super Precision Angular Contact Ball Bearings
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S7008 ACD/P4ADBB Bearing Product Overview & Core Advantages
The S7008 ACD/P4ADBB is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This matched set features a Back-to-Back (DB) arrangement, providing superior resistance to moment loads and high system rigidity. With a P4A tolerance class and light preload (Class B), it is engineered for high-speed operation and precise positioning, making it an ideal solution for high-performance spindles and other precision machinery where combination loads are present.
S7008 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
- S7008: Basic model number for a 40mm bore, 68mm OD angular contact ball bearing.
- ACD: Signifies "Angular Contact, Duplex" configuration.
- P4A: Denotes an ultra-precision tolerance class, exceeding ABEC 7 standards, ensuring extremely tight dimensional and running accuracy.
- DBB: Indicates the specific "Duplex Back-to-Back" mounting arrangement of the two bearings in the set.
S7008 ACD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back design creates a wide, rigid support system that effectively handles combined radial and axial loads from both directions, as well as overturning moments. The 25° contact angle is optimized for high axial load capacity.
High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and contributes to the high limiting speed of 41,000 rpm. This, combined with the grease lubrication and precision manufacturing, ensures stable operation at high rotational velocities.
Precision & Longevity: Manufactured to P4A tolerance class with a light preload, this bearing eliminates internal clearance, reduces noise and vibration, and enhances positional accuracy. The sealed design and high-quality chrome steel construction ensure reliable, long-term performance.
S7008 ACD/P4ADBB Bearing Typical Application Areas
This high-precision bearing is specifically designed for applications where maximum rigidity and speed are critical. Its primary uses include:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Grinding Spindles
- High-Frequency Motor Spindles
- Industrial Pumps and Compressors requiring high-speed shaft support
