7005 ACD/P4AQBTC
7000 Series Super Precision Angular Contact Ball Bearings
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7005 ACD/P4AQBTC Bearing Product Overview & Core Advantages
The 7005 ACD/P4AQBTC is a high-precision quadruplex matched angular contact ball bearing designed for the most demanding applications. Its core advantage lies in its Moderate (Class C) preload and Quadruplex Tandem Back-to-Back (QBT) arrangement, which delivers exceptional system rigidity and axial stability. This configuration is engineered to handle significant combined loads (radial and axial) simultaneously, making it an ideal choice for high-speed spindles and precision machinery where maximum accuracy and reliability are paramount. The P4A tolerance class ensures ultra-precise running accuracy.
7005 ACD/P4AQBTC Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning | Advantage |
|---|---|---|
| 7005 | Standard bore diameter (25 mm) and series designation. | Standardized bearing dimensions for easy integration. |
| ACD | Angular Contact, 25° contact angle, Duplex (in this context, part of a matched set). | Optimized for high axial load capacity and high rigidity. |
| P4A | High precision tolerance class (superior to ABEC 7). | Guarantees minimal runout and vibration for superior performance in high-speed applications. |
| QBT | Quadruplex Tandem Back-to-Back arrangement. | Provides maximum system stiffness and can withstand axial loads in both directions. |
| C | Moderate preload designation (Class C). | Optimizes bearing performance by eliminating internal clearance, enhancing rigidity and positioning accuracy. |
7005 ACD/P4AQBTC Bearing Structural Features & Performance Benefits
Matched Set & Preload: The four bearings are manufactured and selected as a matched set with a controlled moderate preload. This eliminates internal clearance, resulting in superior rotational accuracy, drastically reduced axial and radial runout, and significantly increased system stiffness from the moment of installation.
High Load Capacity: The 25° contact angle and the robust QBT arrangement enable the bearing set to support high combined loads. The high dynamic and static load ratings ensure long service life under demanding conditions.
High-Speed Capability: The lightweight phenolic cage is engineered for high-speed operation, reducing centrifugal forces and friction. This, combined with the precision P4A grading, allows the set to achieve a high limiting speed of 85,000 rpm.
Material & Lubrication: Constructed from high-grade chrome steel for both rings and balls, ensuring durability and fatigue resistance. The bearings are pre-lubricated for immediate operation within a specified temperature range.
7005 ACD/P4AQBTC Bearing Typical Application Areas
This precision-matched bearing set is specifically designed for high-performance machinery requiring extreme rigidity and speed. Its primary applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, semiconductor manufacturing equipment.
- High-Frequency Motors: Spindles for routers and other high-RPM applications.
- Robotics: High-accuracy robotic arm joints and gears.
