7012 ACDGA/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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7012 ACDGA/P4A Bearing Product Overview & Core Advantages
The 7012 ACDGA/P4A is a single row angular contact ball bearing manufactured to P4A super precision tolerance class. Engineered for applications demanding exceptional rotational accuracy and high-speed performance, this bearing is characterized by its 25° contact angle and phenolic resin cage. Its primary advantage lies in its ability to support combined loads, handling significant axial loads in one direction alongside radial loads. The bearing comes pre-lubricated and is part of a universally matchable (SU) set, allowing for precise preload control when mounted in pairs or triplets, making it ideal for high-rigidity, high-reliability spindles and precision machinery.
7012 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Interpretation | Technical Significance |
|---|---|---|
| 7012 | Basic Series & Size | Denotes a metric 70-series angular contact bearing with a 60mm bore, 95mm OD, and 18mm width. |
| AC | Angular Contact | The fundamental design optimized for combined loads. |
| D | Contact Angle | Specifies a 25° contact angle, balancing axial and radial load capacity. |
| GA | Preload Class | Indicates Extra Light (Class A) preload, minimizing friction and heat generation for superior high-speed operation. |
| P4A | Tolerance Class | Signifies super precision tolerances for running accuracy, ensuring minimal vibration and extreme positional stability. |
7012 ACDGA/P4A Bearing Structural Features & Performance Benefits
High-Speed Capability: The combination of a lightweight phenolic resin cage, extra light preload (GA), and optimized internal geometry enables a high limiting speed of 35,000 rpm, reducing centrifugal forces and operational temperatures.
Superior Running Accuracy: Manufactured to P4A tolerance class with tight dimensional control on the bore, outside diameter, and width, this bearing guarantees exceptional rotational precision and minimal runout, which is critical for machining quality.
Optimized Load Capacity: The 25° contact angle is engineered to efficiently support substantial axial loads in one direction while maintaining good radial load capacity, making it suitable for applications with combined loads.
Universal Matching (SU): As a universally matchable bearing, it can be paired with any other bearing from the same manufacturing lot in various arrangements (back-to-back, face-to-face, tandem) to achieve specific stiffness and preload requirements without selective mounting.
7012 ACDGA/P4A Bearing Typical Application Areas
The 7012 ACDGA/P4A is designed for high-performance applications where speed, precision, and rigidity are paramount. Key industries and machinery 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 high-speed electric motors.
- Robotics: High-accuracy joints and rotary actuators.
