709 CD/P4ADBA
Miniature Super Precision Angular Contact Ball Bearings
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709 CD/P4ADBA Bearing Product Overview & Core Advantages
The 709 CD/P4ADBA is a precision duplex angular contact ball bearing configured in a back-to-back (DB) arrangement. Engineered for applications demanding exceptional rotational accuracy and rigidity, this matched pair is preloaded to Extra Light (Class A) standards. Its primary advantage lies in its ability to handle combined loads—simultaneously supporting substantial radial loads and axial loads in both directions—making it an ideal solution for high-precision, high-reliability systems requiring minimal runout and maximum stability.
709 CD/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 709 | Basic bearing series designation. |
| CD | Indicates a duplex pair in a Back-to-Back (DB) arrangement, providing high moment rigidity. |
| P4A | Specifies a high-precision tolerance class (superior to ABEC 7), ensuring extremely tight dimensional and running accuracy. |
| DB | Reiterates the Back-to-Back mounting configuration. |
| A | Denotes the specific preload level, in this case, Extra Light (Class A). |
709 CD/P4ADBA Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The duplex back-to-back (DB) configuration creates a wide effective spread between load centers, significantly increasing the bearing's resistance to moment loads and enhancing overall system stiffness. This is critical for applications requiring precise shaft positioning.
Superior Load Capacity: With a 15° contact angle and a dynamic load rating of 1287 lbf, this bearing is optimized to handle combined radial and bidirectional axial loads efficiently.
High-Speed Capability: The phenolic resin cage is lightweight and possesses excellent sliding properties, contributing to lower friction, reduced heat generation, and stable operation at high rotational speeds, with a limiting speed of 95,000 rpm.
Precision Performance: Manufactured to P4A tolerance class and featuring a 9 mm bore and 24 mm OD with extremely tight tolerances, this bearing guarantees minimal vibration and superior running accuracy for demanding applications.
709 CD/P4ADBA Bearing Typical Application Areas
The 709 CD/P4ADBA is specifically designed for high-performance machinery where precision and rigidity are paramount. Key application areas include:
- High-Speed Machine Tool Spindles
- Precision Grinding Spindles
- High-Frequency CNC Machining Centers
- Robotic Arm Joints and Precision Gearboxes
- Medical and Dental Handpiece Drives
