71903 CDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71903 CDGA/P4A Bearing Product Overview & Core Advantages
The 71903 CDGA/P4A is a single-row angular contact ball bearing designed for exceptional precision and performance in demanding applications. Positioned in the ultra-precision P4A tolerance class, this bearing delivers superior running accuracy and rotational stability. Its 15° contact angle is optimized to handle combined loads, efficiently supporting significant radial loads while accommodating axial loads in one direction. The bearing comes pre-lubricated and features an open seal type, making it ready for immediate installation in high-speed spindles and precision machinery where minimal vibration and maximum reliability are critical.
71903 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71903 | Basic bearing series and size designation (17mm bore, 30mm OD, 7mm width). |
| C | 15° contact angle, optimized for high-speed operation and combined load capacity. |
| DG | Universal Matchable (Universal Matchable (SU)). The bearing can be supplied in matched sets of 4 for preload control in duplex arrangements. |
| A | Extra light preload (Class A). Provides minimal internal clearance for high rigidity and precise rotational accuracy. |
| /P4A | Ultra-precision tolerance class. Exceeds ABEC 7 standards, ensuring extremely tight dimensional and running accuracy. |
71903 CDGA/P4A Bearing Structural Features & Performance Benefits
High-Speed & Precision Design: The combination of a phenolic resin cage, a 15° contact angle, and ultra-precision P4A tolerances enables stable operation at the high limiting speed of 80,000 rpm. This makes it ideal for high-speed spindle applications.
Superior Rigidity and Load Capacity: Manufactured from chrome steel for both rings and balls, the bearing offers high durability. With a dynamic load rating of 936 lbf and a static load rating of 468 lbf, it provides reliable performance under significant combined radial and axial loads.
Universal Matching Capability: Designated as Universal Matchable (SU), these bearings can be supplied in precision-matched sets of 4. This allows for flexible duplex mounting configurations (DB, DF, DT) to achieve the required preload and system rigidity without selective assembly.
Optimized for Precision Applications: The open design with pre-lubrication minimizes friction and heat generation, while the tight width tolerance ensures consistent performance in complex assemblies.
71903 CDGA/P4A Bearing Typical Application Areas
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Dental and Medical Handpieces
- Aerospace Gyroscopes and Instrumentation
- High-Performance Robotics and Automation Drives
