7213 CD/PA9AQBCC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7213 CD/PA9AQBCC Bearing Product Overview & Core Advantages
The 7213 CD/PA9AQBCC is a precision quadruplex matched set of angular contact ball bearings designed for the most demanding applications. This metric system bearing is characterized by its back-to-back (QBC) arrangement and Moderate (Class C) preload, delivering exceptional system rigidity and rotational accuracy. Its primary advantage lies in its ability to handle combined loads—significant radial and axial loads—simultaneously, making it ideal for high-precision, high-stiffness machinery requiring superior running accuracy and minimal deflection.
7213 CD/PA9AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7213 | Basic bearing series, defining the standard boundary dimensions: 65mm bore, 120mm OD, 23mm single bearing width. |
| CD | Indicates a duplex pair in a back-to-back arrangement. In this context, it is part of a larger matched set. |
| PA9A | Specifies the high-precision tolerance class, ensuring extremely tight dimensional and running accuracy for the bearing rings. |
| QBCC | Denotes a Quadruplex (4-bearing) matched set in a Back-to-Back configuration with Moderate (Class C) preload applied. |
7213 CD/PA9AQBCC Bearing Structural Features & Performance Benefits
Optimized Stiffness and Load Capacity: The quadruplex back-to-back (QBC) arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection. This configuration significantly increases the radial and axial load ratings, with a dynamic rating of 40,050 lbf and a static rating of 47,700 lbf.
High-Speed Capability: The 15° contact angle provides an excellent balance between radial and axial load capacity, suitable for high-speed operation. The lightweight phenolic resin cage ensures stable operation and contributes to the high limiting speed of 32,500 rpm.
Precision Performance: Manufactured to the PA9A tolerance class with extremely tight bore, outside diameter, and width tolerances, this bearing guarantees superior running accuracy, low vibration, and minimal heat generation.
Preloaded & Ready-to-Mount: The moderate preload (Class C) is factory-set, eliminating the need for complex adjustment during installation. This ensures immediate optimal performance, reduced noise, and enhanced system rigidity from startup.
7213 CD/PA9AQBCC Bearing Typical Application Areas
Due to its high precision, rigidity, and speed capabilities, the 7213 CD/PA9AQBCC is ideally suited for:
- High-Frequency Machine Tool Spindles (e.g., milling, grinding, and drilling spindles)
- Precision Robotic Drives and Actuators
- High-Speed Compressors and Pumps
- Aerospace and Defense Actuation Systems
- Advanced Medical and Laboratory Equipment
