7213 CDGA/P4A
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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7213 CDGA/P4A Bearing Product Overview & Core Advantages
The 7213 CDGA/P4A is a single row angular contact ball bearing engineered for applications demanding exceptional precision and high-speed operation. Manufactured to P4A super-precision tolerance standards, this bearing delivers superior running accuracy and rotational stability. Its 15° contact angle is optimized to support significant axial loads in one direction while accommodating radial loads, making it ideal for high-rigidity spindle arrangements. The bearing is universally matchable (SU), allowing for precise preload control when mounted in sets, and comes pre-lubricated for immediate service. Its phenolic cage contributes to smooth high-speed performance.
7213 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| 7213 | Basic bearing designation indicating a metric series with a 65mm bore, 120mm OD, and 23mm width. |
| C | Specifies a 15° contact angle, optimized for high-speed applications requiring a balance of axial and radial load capacity. |
| DG | Indicates the bearing is a Universal Matchable (SU) bearing, designed to be mounted in sets (typically back-to-back or face-to-face) to achieve specific preload and stiffness characteristics. |
| A | Denotes an Extra Light preload class. This internal preload ensures minimal axial play and enhances rigidity at high speeds. |
| P4A | The tolerance class, signifying super-precision levels with very tight dimensional and running accuracy tolerances for the most demanding applications. |
7213 CDGA/P4A Bearing Structural Features & Performance Benefits
High Precision & Rigidity: The P4A tolerance class ensures extremely tight dimensional control, resulting in superior running accuracy, reduced vibration, and enhanced system rigidity. The extra light preload (Class A) eliminates internal clearance, providing immediate stiffness for high-precision machining and positioning.
Optimized High-Speed Performance: The lightweight phenolic resin cage offers excellent strength-to-weight ratio and operates smoothly with minimal friction at high rotational speeds, contributing to the high limiting speed of 32,500 rpm. The 15° contact angle is ideal for high-speed spindle applications.
Superior Load Capacity: With a dynamic load rating of 14,918 lbf and a static load rating of 11,925 lbf, this bearing is capable of handling significant combined (radial and axial) loads. The high-grade chrome steel construction ensures durability and long service life.
Universal Matching Capability: The Universal Matchable (SU) designation means these bearings are manufactured to specific tolerances that allow them to be mounted in sets of two or more (typically 4 in a set) without selective assembly, simplifying installation and ensuring consistent, predictable preload.
7213 CDGA/P4A Bearing Typical Application Areas
The 7213 CDGA/P4A is designed for high-performance machinery where precision, speed, and rigidity are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines, high-frequency motor spindles.
- Robotics: High-accuracy robotic arm joints and rotary actuators.
- Medical Equipment: Dental handpieces, laboratory centrifuges.
- Aerospace & Defense: Gyroscopes, radar systems, and other precision instrumentation.
