7030 ACD/P4ATT
7000 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 7030 ACD/P4ATT is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This bearing features a triplex tandem (3-DT) matched arrangement, where three individual bearings are pre-loaded and supplied as a single, matched set. This configuration delivers superior axial rigidity and is engineered to handle primarily unidirectional axial loads with high precision. Manufactured to P4A tolerance class, it ensures minimal runout and consistent performance in high-speed, high-precision machinery. Its robust construction and phenolic cage contribute to reliable operation at limiting speeds up to 11,000 rpm.
7030 ACD/P4ATT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7030 | Basic bearing series, indicating a 150 mm bore, 225 mm outside diameter, and 105 mm width. |
| ACD | Angular Contact Design with a 25° contact angle, optimized for high axial load capacity. |
| P4A | High precision tolerance class exceeding ABEC 7, ensuring extremely tight dimensional and running accuracy. |
| TT | Indicates the bearing is part of a Triplex Tandem (3-DT) pre-loaded set. |
Structural Features and Performance Benefits
Triplex Tandem Matched Set: The core structural feature is the three-bearing tandem arrangement, which provides an exceptionally high level of axial stiffness. This is critical for applications where shaft displacement under heavy axial loads must be minimized.
Superior Load Capacity: With a 25° contact angle and a radial dynamic load rating of 78,975 lbf, this bearing is engineered to sustain significant axial and combined loads. The tandem setup multiplies the axial load-carrying capability of a single bearing.
High-Speed Performance: The lightweight and durable phenolic resin cage ensures stable operation and reduced centrifugal forces, enabling the bearing to achieve its limiting speed of 11,000 rpm. The open design facilitates efficient lubrication and cooling.
Precision Engineering: The P4A tolerance class and tight dimensional tolerances on the bore, outside diameter, and width guarantee precise shaft positioning and smooth, vibration-free rotation, which is essential for high-precision spindles.
7030 ACD/P4ATT Bearing Typical Application Areas
The 7030 ACD/P4ATT is ideally suited for high-performance machinery where maximum axial rigidity and precision are non-negotiable. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: For PCB drilling, semiconductor manufacturing, and other high-accuracy processes.
- High-Frequency Machining Centers: Where tandem bearing arrangements are used to counteract intense axial cutting forces.
- Industrial Pumps and Compressors: For applications requiring precise axial location and high-speed operation.
