7012 ACD/P4AQBCA
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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7012 ACD/P4AQBCA Bearing Product Overview & Core Advantages
The 7012 ACD/P4AQBCA is a precision angular contact ball bearing configured in a quadruplex back-to-back (QBC) matched set. Engineered for applications demanding extreme rigidity and accuracy, this bearing is designed to accommodate combined radial and axial loads simultaneously. Its P4A tolerance class ensures superior running accuracy, making it ideal for high-speed, high-precision machinery. The extra light preload (Class A) minimizes deflection under operational stresses, providing exceptional system stability and positioning accuracy.
7012 ACD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7012 | Basic bearing series and size designation (60mm bore, 95mm OD, 72mm width) |
| ACD | Angular Contact design with a 25° contact angle |
| P4A | High Precision Tolerance Class (exceeding ABEC 7/ISO P4 standards) |
| QBC | Quadruplex Back-to-Back arrangement of four matched bearings |
7012 ACD/P4AQBCA Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The quadruplex back-to-back configuration creates an exceptionally rigid bearing system capable of withstanding heavy combined loads and moment loads. This arrangement provides superior resistance to operational deflection.
Precision Performance: Manufactured to P4A tolerance class with tight dimensional control (bore/OD tolerance: -0.004mm to 0), this bearing ensures minimal runout and vibration for high-speed applications up to 39,000 rpm.
Optimized Internal Design: Features 19 precision balls with 11.112mm diameter and a phenolic cage that provides excellent strength-to-weight ratio, reduced friction, and suitability for high-speed operation.
Material Excellence: Constructed from chrome steel for both rings and balls, ensuring high durability, wear resistance, and consistent performance under the specified temperature range of -30°C to 110°C.
7012 ACD/P4AQBCA Bearing Typical Application Areas
The 7012 ACD/P4AQBCA is specifically designed for demanding applications requiring ultra-high precision and rigidity:
- Machine Tool Spindles - High-speed milling, grinding, and turning centers
- Precision Robotics - Articulated arms and positioning systems
- Aerospace Systems - Guidance mechanisms and flight control actuators
- Medical Equipment - High-speed dental handpieces and surgical tools
- Test & Measurement Instruments - Coordinate measuring machines and optical systems
