71913 CDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71913 CDGA/P4A Bearing Product Overview & Core Advantages
The 71913 CDGA/P4A is a single row angular contact ball bearing designed for high-precision applications. Engineered to a super-precision P4A tolerance class, it delivers exceptional rotational accuracy and dimensional stability. Its primary function is to accommodate combined loads, efficiently handling both radial and significant axial loads in one direction. The 15° contact angle provides an optimal balance for high-speed operation and axial load capacity. This bearing is universally matchable (SU), allowing for precise preload control when mounted in pairs or sets, making it ideal for demanding applications requiring high rigidity and minimal runout.
71913 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71913 | Basic bearing series and size designation (65mm bore, 90mm OD, 13mm width). |
| C | Specifies a 15° contact angle. |
| DG | The bearing rings are universally matchable (SU). Two bearings can be paired in a back-to-back (DB) or face-to-face (DF) arrangement to accommodate combined loads. |
| A | Indicates an Extra light preload (Class A). |
| P4A | Denotes a super-precision tolerance class, exceeding ABEC 7/ISO P4 standards, for exceptional running accuracy. |
71913 CDGA/P4A Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Manufactured to P4A tolerance class with extremely tight dimensional tolerances on the bore, outside diameter, and width. This ensures minimal vibration and high system rigidity, which is critical for precision spindles.
- Optimized for Combined Loads: The angular contact design with a 15° contact angle is engineered to support significant axial loads in addition to radial loads, a key requirement in many high-speed applications.
- High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, while the open design and factory-applied lubrication contribute to a high limiting speed of 31,000 rpm, making it a true high-speed bearing.
- Universal Matching: The SU universal matching feature allows for simplified mounting of bearings in pairs to create a preloaded set, enhancing stiffness and rotational accuracy without selective assembly.
- Durable Construction: Made from high-grade chrome steel for both rings and balls, ensuring long service life and consistent performance under demanding conditions.
71913 CDGA/P4A Bearing Typical Application Areas
The 71913 CDGA/P4A is specified for high-performance machinery where precision, speed, and reliability are paramount. Key application areas include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for electric motors requiring ultra-high rotational speeds.
- Robotics: High-accuracy joints and arm assemblies.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
