S71911 ACD/P4ADBC
Sealed Super Precision Angular Contact Ball Bearings
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S71911 ACD/P4ADBC Bearing Product Overview & Core Advantages
The S71911 ACD/P4ADBC is a precision duplex back-to-back angular contact ball bearing designed for demanding applications requiring exceptional rigidity and running accuracy. This P4A tolerance class bearing features a phenolic cage and comes pre-lubricated with grease, enabling it to handle combined radial and axial loads simultaneously. Its compact design and moderate preload (Class C) make it ideal for high-speed spindles and other precision machinery where high rigidity and dimensional stability are critical.
S71911 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S | Super-precision bearing |
| 7 | Angular contact ball bearing |
| 1911 | Dimension series (19) and bore code (11 → 55 mm) |
| ACD | Contact angle of 25° |
| P4A | High precision tolerance class (equivalent to ABEC 7) |
| DB | Duplex Back-to-Back arrangement |
S71911 ACD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement creates a rigid bearing system that effectively resists moment loads. With a 25° contact angle and a radial dynamic load rating of 6660 lbf, this bearing is engineered to handle significant combined loads.
High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces, contributing to a high limiting speed of 34,000 rpm. This makes it suitable for high-speed applications requiring minimal vibration.
Precision & Stability: Manufactured to P4A tolerance class with tight dimensional tolerances (bore/OD: -0.004mm to 0), this bearing ensures precise running accuracy and minimal runout for demanding applications.
Sealed & Pre-lubricated: The sealed design with grease lubrication provides protection against contamination and offers reliable operation within a temperature range of -30°C to 110°C.
S71911 ACD/P4ADBC Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles
- Precision Equipment: Measuring instruments, optical devices
- High-Speed Rotating Machinery: Dental handpieces, small precision motors
- Industrial Pumps & Compressors: Where high precision and rigidity are required
