7213 CD/PA9ADBC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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7213 CD/PA9ADBC Bearing Product Overview & Core Advantages
The 7213 CD/PA9ADBC is a precision duplex angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This matched back-to-back arrangement (DB) provides superior stability when handling combined radial and axial loads from both directions. Manufactured to an ultra-precise PA9A tolerance class and featuring a moderate preload (Class C), it delivers reliable performance in high-speed, high-precision machinery. The phenolic cage contributes to smooth operation at the limiting speed of 32,500 rpm.
7213 CD/PA9ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 7213 | Basic bearing series; 65 mm bore, 120 mm OD, 46 mm width |
| C | 15° contact angle design |
| D | Duplex (paired) bearing set |
| DB | Back-to-Back arrangement for high moment rigidity |
| PA9A | Ultra-high precision tolerance class |
7213 CD/PA9ADBC Bearing Structural Features & Performance Benefits
Optimized Rigidity & Load Capacity: The back-to-back duplex configuration creates a wide effective spread, significantly increasing system rigidity and moment load capacity. This bearing can simultaneously handle substantial radial loads (24,300 lbf dynamic) and axial loads from both directions.
High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, enabling stable operation at high rotational speeds up to 32,500 rpm. The 15° contact angle provides an optimal balance between axial load capacity and speed capability.
Precision Engineering: Manufactured to PA9A tolerance class with extremely tight dimensional tolerances (bore/OD: -0.004mm to 0), this bearing ensures minimal runout and vibration for precision applications.
Material Quality: Constructed from chrome steel for both rings and balls, providing high hardness, wear resistance, and long service life under demanding conditions.
7213 CD/PA9ADBC Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring precision and rigidity
- Precision Gearboxes: Industrial transmissions where accurate shaft positioning is critical
- High-Frequency Motors: Spindle motors and high-RPM industrial drives
- Robotic Arms: Joint and articulation points demanding high moment stiffness
- Medical Equipment: High-speed dental handpieces and precision medical devices
- Aerospace Systems: Actuators and control surface mechanisms
