71811 ACDGB/P4
71800 Series Super Precision Angular Contact Ball Bearings
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71811 ACDGB/P4 Bearing Product Overview & Core Advantages
The 71811 ACDGB/P4 is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a single bearing with a Universal Matchable (SU) designation, it can be universally paired with other bearings of the same type to form a preloaded duplex set, offering superior system stability. Its key advantages include high speed capability, excellent running accuracy from its P4 tolerance class, and the ability to accommodate combined radial and axial loads simultaneously, making it ideal for high-performance spindles and precision machinery.
71811 ACDGB/P4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71811 | Basic bearing series and size designation (55mm bore, 72mm OD, 9mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Optimized internal design for high-precision applications. |
| GB | A Light preload (Class B) is applied to ensure high rigidity and minimal axial/radial play. |
| /P4 | Denotes a super-precision tolerance class for exceptional dimensional and running accuracy. |
71811 ACDGB/P4 Bearing Structural Features & Performance Benefits
High Rigidity and Precision: The P4 tolerance class ensures extremely tight dimensional control on the bore diameter, outside diameter, and width, resulting in superior running accuracy. The phenolic cage material contributes to smooth operation at high speeds with low friction.
Optimized Load Capacity: With a 25° contact angle, this bearing is engineered to handle significant combined loads. The radial dynamic load rating of 2151 lbf and static load rating of 2295 lbf provide reliable performance under demanding conditions.
High-Speed Performance: The lightweight phenolic cage and optimized internal geometry enable a high limiting speed of 34,000 rpm. The bearing is pre-lubricated, ensuring immediate readiness and stable performance throughout its operational temperature range of -30°C to 110°C.
Universal Matching Capability (SU): This bearing is designed for universal matching, allowing any number of bearings (here, a set of 4) to be mounted together in various configurations (back-to-back, face-to-face, or tandem) to achieve the required system rigidity and load capacity without selective assembly.
71811 ACDGB/P4 Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme precision and rigidity.
- Precision Instrumentation: Measuring devices, optical scanners, and coordinate measuring machines (CMM).
- High-Frequency Spindles: PCB drilling, engraving, and small tool machining spindles.
- Robotics: High-accuracy joints and actuators in industrial robots.
