707 ACD/P4ADBB
Miniature Super Precision Angular Contact Ball Bearings
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707 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 707 ACD/P4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This metric system bearing features a back-to-back (DB) matched arrangement and a P4A super-precision tolerance class, making it ideal for high-speed spindles and other demanding machinery. Its core advantage lies in its ability to support combined radial and axial loads simultaneously with high rigidity and running accuracy, ensuring reliable performance in precision equipment.
707 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 707 | Basic bearing series designation. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex (two bearings in a set). |
| P4A | High-Precision Tolerance Class, defining extremely tight dimensional and running accuracy tolerances. |
| DB | Back-to-Back mounting arrangement, which provides high moment rigidity. |
| B | Light Preload (Class B) applied to the matched set for optimal stiffness and minimal runout. |
707 ACD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The duplex back-to-back (DB) arrangement creates a wide effective spread between load centers, significantly increasing the bearing's resistance to moment loads and providing high operational rigidity. This configuration, combined with the 25° contact angle, enables the bearing to efficiently handle combined radial and axial loads.
High-Speed Performance: The phenolic resin cage is lightweight and possesses excellent sliding properties, contributing to lower friction and enabling the bearing to achieve its high limiting speed of 170,000 rpm. The open design and factory-applied lubrication facilitate efficient heat dissipation.
Precision Engineering: Manufactured to P4A super-precision standards with very tight bore, outer diameter, and width tolerances, this bearing ensures minimal vibration and exceptional running accuracy, which is critical for applications like machine tool spindles.
707 ACD/P4ADBB Bearing Typical Application Areas
The 707 ACD/P4ADBB is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- High-Frequency Spindles for CNC machining centers and precision grinding machines
- High-Speed Robotics and automation equipment
- Precision Medical and Dental Equipment
- Aerospace Instrumentation and control systems
- High-Speed Motors and encoder systems
