7009 ACD/P4ATBTC
7000 Series Super Precision Angular Contact Ball Bearings
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7009 ACD/P4ATBTC Bearing Product Overview & Core Advantages
The 7009 ACD/P4ATBTC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched bearing set consists of three bearings arranged in a Triplex Back-to-Back (TBT) configuration, providing superior stability and the ability to handle significant combined loads (radial and axial). With its P4A tolerance class and moderate preload (Class C), it delivers high running accuracy and is ideally suited for high-speed, high-rigidity spindles and precision machinery.
7009 ACD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7009 | Basic bearing designation (45mm bore, 75mm OD) |
| ACD | Angular Contact Design with a 25° contact angle |
| P4A | High precision tolerance class (superior to ABEC 7) |
| TBT | Triplex Back-to-Back matched arrangement |
| C | Moderate preload level for optimal rigidity and speed |
7009 ACD/P4ATBTC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The Triplex Back-to-Back (TBT) arrangement of three bearings creates an extremely rigid bearing system, capable of withstanding heavy combined loads and moments. The 25° contact angle is optimized for supporting substantial axial loads in both directions.
High-Speed Performance: The phenolic cage ensures low friction and excellent performance at high rotational speeds, with a limiting speed of 41,000 rpm. The open design and factory lubrication facilitate efficient heat dissipation.
Precision & Accuracy: Manufactured to a P4A tolerance class with tight dimensional control on the bore, outside diameter, and width, this bearing guarantees high running accuracy and minimal vibration for precision applications.
7009 ACD/P4ATBTC Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is engineered for advanced machinery, including:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Grinding Spindles
- High-frequency Main Motor Spindles
- Other applications requiring high rigidity and exceptional rotational accuracy
