S71905 ACDGC/P4A
Sealed Super Precision Angular Contact Ball Bearings
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S71905 ACDGC/P4A Bearing Product Overview & Core Advantages
The S71905 ACDGC/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a single bearing with a 25° contact angle and P4A tolerance class, it provides superior running accuracy and is capable of supporting combined loads (radial and axial loads simultaneously). Its compact design, featuring a 9 mm width, makes it ideal for high-precision spindles and other space-constrained, high-reliability applications. The bearing is Universal Matchable (SU), allowing for precise preload setting when mounted with other bearings from the same manufacturing lot.
S71905 ACDGC/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S7 | Series designation for super-precision angular contact ball bearings. |
| 1905 | Bore size code (05 = 25 mm bore). |
| AC | Angular Contact design with a 25° contact angle. |
| D | High contact angle for increased axial load capacity. |
| GC | Internal clearance group, optimized for moderate preload (Class C). |
| P4A | Indicates a super-precision tolerance class with running accuracy requirements tighter than ABEC 7. |
S71905 ACDGC/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The 25° contact angle and robust construction enable the bearing to handle significant combined loads, offering high axial and radial stiffness for stable operation.
- Superior High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, contributing to a high limiting speed of 83,000 rpm. This makes it an excellent high-speed bearing for demanding applications.
- Exceptional Running Accuracy: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration, which is critical for achieving high surface finishes and precision in machining.
- Optimized for Matched Sets: As a Universal Matchable (SU) bearing, it can be supplied in sets (e.g., DB or DF arrangements) to provide defined preload and stiffness without selective mounting.
- Sealed and Pre-Lubricated: The sealed design with grease lubrication protects against contamination and provides long-term, maintenance-free operation within a temperature range of -30°C to 110°C.
S71905 ACDGC/P4A Bearing Typical Application Areas
The S71905 ACDGC/P4A is engineered for high-performance machinery where precision and speed are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring devices and laboratory equipment.
- High-Frequency Motors and Spindles: PCB drilling spindles and dental handpieces.
- Aerospace Actuation Systems: Gyroscopes and other precision control mechanisms.
