7004 ACD/P4ATBTC
7000 Series Super Precision Angular Contact Ball Bearings
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7004 ACD/P4ATBTC Bearing Product Overview & Core Advantages
The 7004 ACD/P4ATBTC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This triplex matched set, arranged in a Back-to-Back (TBT) configuration, provides superior system rigidity and stability under combined loads (radial and axial). Manufactured to P4A tolerance class with a Moderate (Class C) preload, it is engineered for high-precision, high-reliability scenarios such as machine tool spindles, ensuring optimal performance and long service life.
7004 ACD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7004 | Basic bearing series, indicating a 20mm bore, 42mm OD, and 36mm width. |
| ACD | Angular Contact design with a 25° contact angle for optimal axial load capacity. |
| P4A | Indicates a high-precision tolerance class, exceeding standard ABEC-7 (P4) and including specific running accuracy requirements. |
| TBT | Specifies the Triplex Back-to-Back matched arrangement of three bearings, providing high moment stiffness. |
| C | Denotes the Moderate preload (Class C) applied to the matched set, reducing deflection and improving system rigidity. |
7004 ACD/P4ATBTC Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The triplex back-to-back arrangement creates a highly rigid bearing system capable of withstanding complex combined loads and significant overturning moments, making it ideal for precision spindles.
Superior Load Capacity: The 25° contact angle and robust construction using chrome steel rings and balls provide a high dynamic load rating of 4005 lbf and static load rating of 2745 lbf.
High-Speed Performance: The lightweight phenolic cage and optimized internal geometry contribute to a high limiting speed of 103,000 rpm, suitable for high-speed applications.
Precision & Accuracy: Manufactured to P4A tolerance class with tight dimensional control on bore, OD, and width, ensuring minimal runout and consistent performance in precision assemblies.
7004 ACD/P4ATBTC Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles (High-speed machining centers, grinding spindles)
- Precision Rotary Tables
- High-Frequency Spindles
- Industrial Robotics (Articulated arm joints)
- Medical Equipment (High-speed dental handpieces, imaging scanners)
