7040 ACD/P4ADBB
7000 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Product Overview and Core Advantages
The 7040 ACD/P4ADBB is a precision duplex angular contact ball bearing designed for exceptional performance in demanding applications. This matched back-to-back arrangement (DB) provides superior rigidity and stability, enabling it to handle combined radial and axial loads simultaneously. Manufactured to P4A tolerance class with a light preload (Class B), it delivers high running accuracy and is ideally suited for high-speed spindles and other precision machinery requiring maximum operational reliability.
7040 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7040 | Basic bearing series and size designation. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Duplex (two bearings in a set). |
| P4A | High precision tolerance class, exceeding ABEC 7/ISO P4 standards. |
| DB | Back-to-Back mounting arrangement. |
| B | Light preload classification. |
Structural Features and Performance Benefits
- High Rigidity and Stability: The duplex back-to-back (DB) arrangement creates a large moment load capacity and significantly increases system rigidity, making it ideal for applications subject to overturning moments.
- Superior Load Capacity: The 25° contact angle and optimized internal geometry enable the bearing to support substantial combined loads (radial and axial). With a dynamic load rating of 103,950 lbf and a static load rating of 165,375 lbf, it ensures long service life under heavy-duty conditions.
- Optimized High-Speed Performance: The lightweight phenolic cage and precision-ground chrome steel balls reduce centrifugal forces, allowing for a high limiting speed of 16,250 rpm. The open design facilitates efficient lubrication management for high-speed operation.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on the bore diameter (200 mm), outside diameter (310 mm), and width (102 mm), this bearing guarantees high rotational accuracy and minimal runout.
7040 ACD/P4ADBB Bearing Typical Application Areas
The 7040 ACD/P4ADBB is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and machinery include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: Industrial drives and transmissions.
- High-Frequency Motors and Spindles: Applications requiring minimal vibration and high rotational accuracy.
- Medical and Laboratory Equipment: Centrifuges and other precision instruments.
- Printing and Paper Processing Machinery: High-speed rollers and cylinders.
