S71905 ACE/P4ADBB
Sealed Super Precision Angular Contact Ball Bearings
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S71905 ACE/P4ADBB Bearing Product Overview & Core Advantages
The S71905 ACE/P4ADBB is a metric precision angular contact ball bearing designed for demanding applications requiring high rigidity and exceptional running accuracy. This duplex back-to-back (DB) matched set is preloaded to Light / Class B, providing superior system stiffness and precise rotational performance. Its primary advantage lies in its ability to handle combined loads—significant radial loads alongside substantial axial loads in both directions—making it an ideal choice for high-speed spindles and precision machinery where positional accuracy and minimal runout are critical.
S71905 ACE/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7 | Series designation for high-precision angular contact ball bearings. |
| 1905 | Bore diameter: 25 mm, Outside diameter: 42 mm, Width: 18 mm. |
| ACE | Contact angle of 25° and specific internal design optimizations. |
| P4A | High precision tolerance class (superior to ABEC 7), ensuring extremely tight dimensional and running accuracy. |
| DBB | Indicates a Duplex Back-to-Back preloaded pair, providing high moment stiffness. |
S71905 ACE/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back arrangement of two bearings creates a wide, rigid support system, significantly increasing resistance to moment loads. The 25° contact angle is optimized to handle high combined radial and axial loads simultaneously.
High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the P4A precision and optimized internal geometry contribute to smooth operation and a high limiting speed of 83,000 rpm.
Sealed & Pre-Lubricated: As a sealed bearing, it is filled with high-performance grease, protecting against contamination and providing long-term, maintenance-free operation within its specified temperature range.
Precision Engineering: Manufactured from high-grade chrome steel with extremely tight dimensional tolerances on the bore, outside diameter, and width, ensuring predictable performance and easy integration into precision assemblies.
S71905 ACE/P4ADBB Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC lathes.
- Precision Rotary Systems: High-frequency spindles, measuring instruments, and optical scanners.
- Robotics: High-accuracy joints and arm assemblies requiring high rigidity.
- Medical Equipment: Dental handpieces and small, high-speed medical drills.
