71813 ACD/P4TBTB
71800 Series Super Precision Angular Contact Ball Bearings
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71813 ACD/P4TBTB Bearing Product Overview & Core Advantages
The 71813 ACD/P4TBTB is a super-precision angular contact ball bearing designed for the most demanding applications. As part of a triplex back-to-back (TBT) matched set, it delivers exceptional system rigidity and rotational accuracy. Its key advantages include the ability to handle combined radial and axial loads simultaneously, superior high-speed performance enabled by its phenolic cage, and outstanding operational stability due to its P4 tolerance class and light preload. This configuration is ideal for applications requiring maximum stiffness and precision.
71813 ACD/P4TBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71813 | Basic bearing series and size designation (65mm bore, 85mm OD). |
| ACD | Angular Contact Design with a 25° contact angle for optimal axial load capacity. |
| P4 | Indicates a super-precision tolerance class, ensuring extremely tight dimensional and running accuracy. |
| TBT | Specifies a Triplex Back-to-Back matched arrangement of three bearings, providing high system rigidity and moment load capacity. |
| B | Denotes a Light Preload (Class B), which minimizes runout and ensures precise shaft positioning without excessive friction. |
71813 ACD/P4TBTB Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The triplex back-to-back (TBT) arrangement creates a highly rigid bearing system capable of withstanding heavy combined loads and significant moment loads, making it exceptionally stable under complex force conditions.
- Super-Precision Performance: Manufactured to P4 tolerance class with a light preload, this bearing guarantees minimal vibration, ultra-precise rotation, and enhanced positional accuracy for critical machinery.
- Optimized High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, lowers friction, and allows for a high limiting speed of 36,000 rpm, which is essential for high-speed spindles.
- Superior Material & Lubrication: Constructed from high-grade chrome steel for both rings and balls, ensuring durability and long service life. The bearing comes pre-lubricated for immediate operation within a specified temperature range.
71813 ACD/P4TBTB Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is engineered for advanced machinery where accuracy and stability are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and rotary actuators requiring high moment stiffness.
- High-Frequency Motors and Spindles: Applications demanding extreme rotational accuracy and speed.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and other precision instruments.
