7012 ACD/P4ATBTC
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/P4ATBTC Bearing Product Overview & Core Advantages
The 7012 ACD/P4ATBTC is a metric precision angular contact ball bearing supplied as a triplex back-to-back (TBT) matched set. Engineered for applications demanding exceptional rotational accuracy and rigidity, this bearing configuration is designed to handle combined loads—significant radial loads and thrust loads in both directions. Manufactured to the stringent P4A tolerance class, it offers superior running accuracy and dimensional stability. The moderate preload (Class C) ensures optimal stiffness and minimizes deflection under operational stresses, making it ideal for high-precision, high-rigidity systems.
7012 ACD/P4ATBTC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7012 | Standard bearing series number | Defines the basic dimensions: 60mm bore, 95mm OD, 18mm width per bearing. |
| AC | Angular Contact design | Optimized geometry with a 25° contact angle for superior axial load capacity. |
| D | Moderate Preload (Class C) | Pre-set internal clearance provides high system stiffness and precise shaft positioning. |
| P4A | Tolerance Class | Denotes high-precision manufacturing with extremely tight dimensional and running accuracy tolerances. |
| TB | Triplex Back-to-Back arrangement | Three bearings are matched and mounted back-to-back. This configuration provides maximum moment stiffness and stability. |
| T | Phenolic (Textolite) Cage | A lightweight, robust cage material ideal for high-speed operation and reduced friction. |
| Open / Lubricated | Seal Type & Lubrication | Open design for application-specific lubrication systems. The bearing is supplied pre-lubricated for initial operation. |
7012 ACD/P4ATBTC Bearing Structural Features & Performance Benefits
Unmatched Rigidity and Load Capacity: The triplex back-to-back (TBT) arrangement of three angular contact bearings creates an exceptionally rigid support system. This configuration is specifically designed to withstand heavy combined radial and axial loads from multiple directions, as well as high tilting moments, ensuring precise shaft location and minimal deflection.
High-Speed Capability: The use of a lightweight, high-strength phenolic cage (T) minimizes centrifugal forces and ensures stable operation at the high limiting speed of 39,000 rpm. The optimized internal geometry and 25° contact angle further contribute to smooth, high-velocity performance.
Precision Engineering: Conforming to the P4A tolerance class, this matched set guarantees superior dimensional accuracy and run-out control, which is critical for applications requiring minimal vibration and high positional accuracy.
Durable Construction: Manufactured from high-grade chrome steel for both rings and balls, the bearing offers excellent fatigue life and wear resistance, suitable for a wide operating temperature range from -30°C to 110°C.
7012 ACD/P4ATBTC Bearing Typical Application Areas
The 7012 ACD/P4ATBTC is the bearing of choice for the most demanding high-precision machinery, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers where rigidity and accuracy are paramount.
- Precision Grinding Spindles: Provides the necessary stiffness and smooth operation for fine surface finishes.
- High-Frequency Motors and Spindles: Ideal for applications requiring rapid acceleration and deceleration.
- Industrial Pumps and Compressors: Used in high-performance models that handle significant axial and radial forces.
