71918 CDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71918 CDGA/P4A Bearing Product Overview & Core Advantages
The 71918 CDGA/P4A is a single-row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Manufactured to P4A tolerance class, this bearing delivers superior running accuracy and dimensional stability. Its 15° contact angle is optimized to support significant combined loads (radial and axial loads simultaneously), making it ideal for high-speed spindles and precision machinery. The bearing comes pre-lubricated and features a phenolic resin cage, contributing to its high limiting speed of 15,000 rpm and reliable performance in demanding operational environments.
71918 CDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Performance Implication |
|---|---|---|
| 71918 | Basic bearing series designation | High-precision angular contact bearing series with 90mm bore, 125mm OD, 18mm width |
| C | 15° contact angle | Optimized for combined radial and axial load capacity |
| D | High-precision phenolic resin cage | Enables high-speed operation with reduced friction |
| GA | Universal matching bearing with specific preload | Can be mounted in sets (3 bearings) without selective assembly |
| P4A | Super precision tolerance class | Exceptional dimensional and running accuracy for critical applications |
71918 CDGA/P4A Bearing Structural Features & Performance Benefits
High Precision Construction: Manufactured to P4A tolerance standards with bore and outside diameter tolerances of -0.004mm to 0, ensuring exceptional dimensional accuracy and consistent performance in precision applications.
Optimized Load Capacity: The 15° contact angle design provides excellent combined load capability, with dynamic radial load rating of 10,688 lbf and static radial load rating of 11,475 lbf, making it suitable for applications requiring both radial and axial load support.
High-Speed Performance: The phenolic resin cage and optimized internal geometry enable a limiting speed of 15,000 rpm, while the 26 precision balls (11.112mm diameter) ensure smooth operation at high rotational velocities.
Universal Matching Capability: Designed as Universal Matchable (SU) bearings, these components can be mounted in sets of 3 without selective assembly, simplifying installation and ensuring consistent preload characteristics in multi-bearing arrangements.
71918 CDGA/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-precision machining centers, grinding spindles, and milling machine spindles requiring exceptional running accuracy
- High-Speed Machining Centers: Applications demanding both high rotational speeds and precise positioning capabilities
- Precision Instrumentation: Medical equipment, measuring instruments, and optical devices requiring minimal runout and vibration
- Robotics and Automation: Precision robotic joints, rotary tables, and automated manufacturing equipment
- Aerospace Components: Gyroscopes, navigation systems, and other critical aerospace applications requiring reliability and precision
