71903 ACDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 71903 ACDGA/P4A is a single-row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Operating under P4A super-precision tolerance class, this bearing delivers superior running accuracy and dimensional stability. Its 25° contact angle provides optimal performance for combined loads, effectively handling both radial and significant axial loads in one direction. The phenolic cage and universal matching capability make it ideal for high-speed spindle arrangements and precision machinery.
71903 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Performance Benefit |
|---|---|---|
| 71903 | Basic bearing designation (17mm bore, 30mm OD) | Compact size for space-constrained applications |
| AC | Angular Contact design | Optimized for combined radial and axial loads |
| D | High contact angle (25°) | Enhanced axial load capacity |
| GA | Light preload | Reduced deflection, improved stiffness |
| P4A | Super precision tolerance class | Exceptional running accuracy and dimensional stability |
Structural Features and Performance Advantages
High Precision Construction: Manufactured to P4A tolerance class with bore and outside diameter tolerances of -0.004mm to 0, ensuring exceptional dimensional accuracy and minimal runout for precision applications.
Optimized Load Capacity: The 25° contact angle configuration enables efficient handling of combined radial and axial loads, with dynamic load rating of 893 lbf and static load rating of 450 lbf, providing reliable performance under demanding conditions.
High-Speed Performance: The phenolic resin cage and optimized internal geometry allow for limiting speeds up to 121,000 rpm, making it suitable for high-speed spindle applications requiring minimal vibration and heat generation.
Universal Matching Capability: Designed as Universal Matchable (SU), these bearings can be paired in various configurations (DB, DF, DT) to accommodate different load requirements and stiffness characteristics in precision assemblies.
71903 ACDGA/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and precision milling applications
- Precision Instrumentation: Measuring equipment, optical instruments, and laboratory apparatus
- High-Speed Motors: Spindle motors, servo motors, and other high-RPM electric drives
- Medical Equipment: Dental handpieces, surgical tools, and diagnostic imaging systems
- Aerospace Components: Gyroscopes, navigation systems, and auxiliary power units
