S71930 ACD/P4ADBB
Sealed Super Precision Angular Contact Ball Bearings
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S71930 ACD/P4ADBB Bearing Product Overview & Core Advantages
The S71930 ACD/P4ADBB is a precision duplex back-to-back angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched bearing set excels at handling combined radial and axial loads from both directions simultaneously. Manufactured to P4A tolerance class, it delivers superior running accuracy, making it ideal for high-speed spindles and other precision machinery where minimal runout and high operational stability are critical. Its preloaded DB arrangement ensures immediate axial rigidity without requiring additional adjustment during installation.
S71930 ACD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7 | Series designation for high-precision angular contact ball bearings |
| 1930 | Bore diameter: 150 mm, Outside diameter: 210 mm, Width: 56 mm |
| ACD | Angular Contact Design with a 25° contact angle |
| P4A | High-precision tolerance class (exceeds ABEC 7), ensuring extremely tight dimensional and running accuracy |
| DB | Duplex Back-to-Back arrangement; two bearings are matched and preloaded for high moment stiffness |
| Sealed | Integrated seals to retain lubricant and exclude contaminants |
S71930 ACD/P4ADBB Bearing Structural Features & Performance Benefits
Superior Rigidity and Load Capacity: The duplex back-to-back (DB) configuration creates a wide, rigid support system that effectively resists moment loads and complex combined loads. With a dynamic load rating of 40,050 lbf and static load rating of 56,250 lbf, it provides reliable performance under significant stress.
High-Speed Capability: The phenolic resin cage offers excellent strength-to-weight ratio, reducing centrifugal forces and enabling a high limiting speed of 11,000 rpm. The optimized internal geometry and 25° contact angle further enhance high-speed stability.
Precision Engineering: Manufactured to P4A tolerance class with bore and outside diameter tolerances of -0.004mm to 0, this bearing ensures minimal vibration and precise shaft positioning for critical applications.
Long Service Life & Reliability: The sealed design protects the grease lubrication from contamination, supporting consistent performance across a wide operating temperature range of -30°C to 110°C. The matched set is preloaded (Light / Class B) at the factory, ensuring immediate operational readiness and simplified installation.
S71930 ACD/P4ADBB Bearing Typical Application Areas
This high-precision duplex bearing is engineered for applications demanding extreme accuracy, rigidity, and speed:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers
- Precision Gearboxes: Industrial robotics and automation systems
- High-Frequency Motors: Spindle drives and high-performance servomotors
- Medical Equipment: CNC dental mills and medical imaging devices
- Aerospace Systems: Gyroscopes, navigation instruments, and actuator mechanisms
