7012 ACD/P4ADBB
7000 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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7012 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 7012 ACD/P4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement is preloaded to Light / Class B specifications, providing superior system stability and handling combined loads (radial and axial) simultaneously. Manufactured to P4A tolerance class, it guarantees high running accuracy and is ideal for high-speed, high-rigidity applications where precise shaft positioning is critical.
7012 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7012 | Basic bearing series and size designation (60mm bore, 95mm OD, 36mm width) |
| AC | Angular Contact design with a 25° contact angle |
| D | Duplex (two single bearings supplied as a matched set) |
| DB | Back-to-Back mounting arrangement |
| P4A | High precision tolerance class for enhanced running accuracy |
7012 ACD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back configuration creates a rigid bearing system that effectively resists moment loads and provides excellent stability. This design significantly increases the bearing's capacity to handle combined radial and axial loads.
Precision Performance: Manufactured to P4A tolerance class with tight dimensional control (bore and OD tolerance: -0.004mm to 0), this bearing ensures minimal runout and vibration, making it suitable for high-precision applications.
Optimized High-Speed Operation: The phenolic resin cage offers excellent strength-to-weight ratio, reducing centrifugal forces and enabling stable operation at high speeds (limiting speed: 39,000 rpm). The 25° contact angle provides an optimal balance between axial load capacity and speed capability.
Premium Material Construction: Both rings and balls are manufactured from chrome steel, ensuring high durability, wear resistance, and consistent performance under demanding operating conditions.
7012 ACD/P4ADBB Bearing Typical Application Areas
This high-precision duplex bearing is ideally suited for applications requiring exceptional accuracy and rigidity, including:
- Machine Tool Spindles - for milling, grinding, and turning centers
- High-Speed Machining Centers - where precision and rigidity are paramount
- Precision Gearboxes - in industrial automation and robotics
- Medical Equipment Spindles - for dental mills and surgical devices
- Aerospace Positioning Systems - requiring high accuracy and reliability
