7012 ACD/P4ADBC
7000 Series Super Precision Angular Contact Ball Bearings
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7012 ACD/P4ADBC Bearing Product Overview & Core Advantages
The 7012 ACD/P4ADBC is a precision duplex pair of angular contact ball bearings designed for applications demanding exceptional rigidity and running accuracy. This matched set, arranged in a Back-to-Back (DB) configuration, is preloaded to Moderate / Class C specifications, ensuring optimal stiffness and minimal axial/radial runout. Its primary advantage lies in its ability to handle combined loads—significant radial loads alongside substantial thrust loads in both directions—making it an ideal solution for high-precision, high-rigidity spindles and machinery.
7012 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7012 | Standard bearing series number, indicating a 60mm bore, 95mm OD, and 18mm single bearing width. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates the bearing is part of a Duplex pair. |
| P4A | Specifies a high-precision tolerance class (superior to ABEC 7), ensuring extremely tight dimensional and running accuracy. |
| DB | Specifies the Back-to-Back mounting arrangement of the duplex pair. |
| C | Indicates the Moderate preload level applied to the matched set. |
7012 ACD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The Back-to-Back (DB) duplex arrangement creates a wide, rigid support system that effectively resists overturning moments, providing exceptional operational stability for spindles.
Optimized Load Capacity: The 25° contact angle and duplex design enable the bearing set to carry significant combined radial and axial loads from both directions simultaneously.
High-Speed Capability: The lightweight, durable phenolic resin cage minimizes centrifugal forces and ensures stable operation at high rotational speeds, with a limiting speed of 39,000 rpm.
Precision Performance: Manufactured to P4A tolerance class with extremely tight bore, OD, and width tolerances, this bearing guarantees high running accuracy, low vibration, and precise positioning.
Material Integrity: Constructed from high-grade chrome steel for both rings and balls, ensuring high hardness, wear resistance, and long service life under demanding conditions.
7012 ACD/P4ADBC Bearing Typical Application Areas
The 7012 ACD/P4ADBC is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC milling spindles.
- Precision Rotary Systems: Industrial robotics, rotary tables, and indexing heads.
- High-Frequency Motors: Spindles for PCB drilling and high-frequency motor applications.
- Medical & Laboratory Equipment: Centrifuges and other precision rotary devices.
