71956 ACD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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71956 ACD/P4ADBB Bearing Product Overview & Core Advantages
The 71956 ACD/P4ADBB is a high-precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched back-to-back arrangement (DB) provides superior stiffness and moment load capacity, making it ideal for high-speed spindles and precision machinery. The bearing features a P4A tolerance class for ultra-precise running accuracy and a light preload (Class B) for optimal performance under combined radial and axial loads. Its phenolic resin cage ensures reliable operation at high rotational speeds.
71956 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71956 | Basic bearing designation with 280mm bore diameter |
| AC | Angular Contact design with 25° contact angle |
| D | Duplex arrangement (two bearings) |
| P4A | High precision tolerance class with enhanced running accuracy |
| DB | Back-to-Back mounting arrangement |
| B | Light preload classification |
71956 ACD/P4ADBB Bearing Structural Features & Performance Benefits
Enhanced Rigidity & Load Capacity: The back-to-back duplex configuration creates a wide effective spread between load centers, significantly increasing moment stiffness and enabling the bearing to handle substantial combined radial and axial loads simultaneously. With a radial dynamic load rating of 99,450 lbf and static load rating of 194,625 lbf, this bearing delivers exceptional load-carrying performance.
High-Speed Performance: The phenolic resin cage provides excellent strength-to-weight ratio and dimensional stability at high speeds, supporting the bearing's limiting speed of 7,500 rpm. The optimized 25° contact angle balances axial and radial load capacity while maintaining high-speed capability.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional controls (bore and OD tolerance: -0.004mm to 0), this bearing ensures minimal runout and vibration for precision applications. The light preload eliminates internal clearance, providing consistent positioning accuracy and reduced deflection under load.
71956 ACD/P4ADBB Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring precision and rigidity
- Precision Gearboxes: Industrial transmission systems demanding high accuracy and load capacity
- Industrial Pumps & Compressors: Applications needing reliable performance under combined loads
- Robotic Automation: Precision joints and rotary tables in advanced manufacturing systems
- Aerospace Components: Flight control systems and auxiliary power units requiring high reliability
