71811 ACD/P4TBTL
71800 Series Super Precision Angular Contact Ball Bearings
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71811 ACD/P4TBTL Bearing Product Overview & Core Advantages
The 71811 ACD/P4TBTL is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched bearing set is arranged in a Triplex Back-to-Back (TBT) configuration, providing superior stability and the ability to withstand combined loads (radial and axial). With a P4 tolerance class and a 25° contact angle, it is engineered for high-precision, high-reliability scenarios where maximum system rigidity and rotational accuracy are paramount.
71811 ACD/P4TBTL Bearing Model Code Explained, Specifications & Naming Convention
- 71811: Basic bearing series and size designation (55mm bore, 72mm OD, 27mm width).
- ACD: Angular Contact, 25° contact angle design.
- P4: Indicates a high-precision tolerance class for exceptional running accuracy.
- TBT: Denotes a Triplex Back-to-Back preloaded matched set, consisting of three bearings.
- L: Specifies a light preload for optimal rigidity and minimal friction.
71811 ACD/P4TBTL Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The Triplex Back-to-Back (TBT) arrangement creates an extremely rigid bearing system, effectively resisting complex moment loads and providing high resistance to tilting moments. This configuration significantly enhances the bearing's load-carrying capacity for both radial and axial forces.
Precision Performance: Manufactured to P4 tolerance class standards, this bearing ensures minimal runout and superior rotational accuracy, which is critical for high-speed and high-precision machinery.
Optimized High-Speed Operation: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and smoother operation at the high limiting speed of 34,000 rpm. The bearings are pre-lubricated for immediate operation.
Preload & Matched Set: Supplied as a preloaded matched set of three bearings, this eliminates internal clearance and ensures immediate, precise performance upon installation, simplifying assembly and guaranteeing consistent system behavior.
71811 ACD/P4TBTL Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is ideally suited for advanced applications including:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Robotic Drives
- High-Frequency Motor Spindles
- Aerospace & Defense Actuation Systems
- Medical & Dental Equipment Spindles
