S71905 ACDGB/P4A
Sealed Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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S71905 ACDGB/P4A Bearing Product Overview & Core Advantages
The S71905 ACDGB/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a universal matchable single bearing with light preload (Class B), it delivers outstanding running accuracy and rigidity. Its primary advantage lies in its ability to handle combined loads—simultaneously supporting substantial radial loads and axial loads in one direction—making it ideal for high-precision spindles and other critical machinery components where space is constrained and performance is paramount.
S71905 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7 | Series designation for high-precision angular contact ball bearings |
| 1905 | Bore size: 25 mm, Outside diameter: 42 mm, Width: 9 mm |
| AC | 25° contact angle, optimized for high axial load capacity |
| DGB | Universal Matchable (SU) bearing, can be paired in any combination (back-to-back, face-to-face, or tandem) to form a matched set |
| P4A | Tolerance class equivalent to ABEC 7 (P4), with enhanced running accuracy requirements |
S71905 ACDGB/P4A Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The 25° contact angle and precision-ground raceways enable the bearing to support significant combined radial and axial loads. The phenolic resin cage ensures stable operation under high centrifugal forces.
Super-Precision & High-Speed Performance: Manufactured to P4A tolerance class with extremely tight dimensional tolerances (bore/OD: -0.004mm to 0), this bearing guarantees minimal runout and vibration. The lightweight phenolic cage and optimized internal geometry contribute to a high limiting speed of 83,000 rpm with grease lubrication.
Sealed & Pre-Lubricated Design: As a sealed bearing pre-filled with grease, it is protected from contamination and is ready for immediate use, offering a long service life within its specified temperature range of -30°C to 110°C.
Universal Matching Capability (SU): Each bearing is manufactured to universal matching standards, allowing any number of bearings (typically supplied in sets of 3) to be mounted together in any configuration without pre-selection, simplifying installation and ensuring optimal preload and system stiffness.
S71905 ACDGB/P4A Bearing Typical Application Areas
The S71905 ACDGB/P4A is ideally suited for high-performance applications requiring supreme accuracy and speed, including:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Motors
- Robotic Drives and Encoders
- Medical and Dental Equipment Spindles
- Aerospace Control Systems
