71826 ACD/P4DGC
71800 Series Super Precision Angular Contact Ball Bearings
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71826 ACD/P4DGC Bearing Product Overview & Core Advantages
The 71826 ACD/P4DGC is a precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a pre-set pair, it is engineered to accommodate combined loads—simultaneously handling significant radial and axial forces. Its P4 tolerance class ensures ultra-precise dimensions and running accuracy, making it ideal for high-speed spindles and other critical machinery. The phenolic cage and optimized internal geometry contribute to smooth operation at elevated speeds, while the moderate preload (Class C) enhances system stiffness right from installation.
71826 ACD/P4DGC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71826 | Basic bearing designation, defining the standard metric dimensions: 130mm bore, 165mm OD, 36mm width. |
| AC | Angular Contact design with a 25° contact angle, optimized for combined loads. |
| D | Signifies a universal matchable (SU) bearing. Two such bearings can be paired in a back-to-back (DB) or face-to-face (DF) arrangement to handle axial loads in both directions. |
| P4 | Indicates a high-precision tolerance class with extremely tight limits on bore, outer diameter, and width tolerances for superior running accuracy. |
| DGC | Specifies a Moderate Preload (Class C). This preload eliminates internal clearance, increasing system rigidity and improving positional accuracy. |
71826 ACD/P4DGC Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The double-row angular contact design and moderate preload provide exceptional stiffness, enabling the bearing to support substantial combined radial and axial loads without excessive deflection. The 25° contact angle is optimally balanced for thrust capacity and speed.
- Superior High-Speed Performance: The lightweight and robust phenolic resin cage ensures stability and low inertial forces at high rotational speeds, contributing to a limiting speed of 11,000 rpm. The open design facilitates efficient lubrication and cooling.
- Precision Engineering: Manufactured to P4 tolerance class, this bearing guarantees minimal runout and vibration, which is critical for applications requiring high rotational accuracy and surface finish quality.
- Universal Matchability (SU): As a universally matchable bearing, it offers flexibility in mounting. Two identical bearings can be directly paired without selective matching, simplifying inventory and assembly for configurations requiring bidirectional axial load support.
71826 ACD/P4DGC Bearing Typical Application Areas
The 71826 ACD/P4DGC is specified for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines, high-frequency motor spindles.
- Industrial Pumps and Compressors: For handling axial and radial loads in rotating assemblies.
- Robotics and Automation: High-accuracy rotary joints and arm axes.
