7012 CD/P4AQBCA
7000 Series Super Precision Angular Contact Ball Bearings
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7012 CD/P4AQBCA Bearing Product Overview & Core Advantages
The 7012 CD/P4AQBCA is a precision angular contact ball bearing configured in a Quadruplex Back-to-Back (QBC) matched set. Engineered for applications demanding the highest levels of accuracy and rigidity, this bearing is characterized by its P4A tolerance class and Extra Light (Class A) preload. Its primary advantage lies in its ability to provide exceptional stiffness and stability under complex combined loads, making it an ideal solution for high-precision spindles and other critical machinery.
7012 CD/P4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7012 | Standard bearing series designation, indicating a 60 mm bore, 95 mm OD. |
| CD | Indicates a specific internal design and contact angle (15° in this case) optimized for high-precision applications. |
| P4A | Denotes an ultra-precision tolerance class exceeding ABEC 7, ensuring minimal runout and superior rotational accuracy. |
| QBC | Signifies the bearing is supplied as a Quadruplex Back-to-Back matched set of four bearings, pre-configured to handle moment loads and provide maximum system rigidity. |
| A | Specifies the Extra Light preload level, which minimizes friction and heat generation while maintaining precise shaft positioning. |
7012 CD/P4AQBCA Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The Quadruplex Back-to-Back (QBC) arrangement creates a highly rigid bearing system that effectively resists moment loads and deflection, ensuring precise shaft location and minimal runout under heavy combined loads.
Superior Precision: Manufactured to P4A tolerance class standards, this bearing guarantees extremely tight dimensional and running accuracy, which is critical for applications requiring high rotational precision.
Optimized High-Speed Performance: The phenolic cage is lightweight and robust, contributing to lower centrifugal forces and stable operation at the high limiting speed of 34,000 rpm. The 15° contact angle offers an excellent balance between radial load capacity and high-speed capability.
High Load Capacity: With a dynamic load rating of 23,850 lbf and a static load rating of 31,500 lbf, the bearing is capable of sustaining significant radial and axial forces encountered in demanding applications.
7012 CD/P4AQBCA Bearing Typical Application Areas
This high-precision angular contact ball bearing is specifically designed for the most demanding applications, including:
- High-Speed Machine Tool Spindles (e.g., for milling, grinding, and drilling)
- Precision Grinding Spindles
- High-frequency Main Spindles
- Other precision rotary equipment where exceptional rigidity, accuracy, and speed are paramount.
