71920 ACDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71920 ACDGA/P4A Bearing Product Overview & Core Advantages
The 71920 ACDGA/P4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. Designed to accommodate primarily axial loads in one direction, this bearing features a 25° contact angle and P4A super-precision tolerance classification, ensuring superior running accuracy and minimal vibration. Its phenolic resin cage and optimized internal geometry contribute to stable performance at high speeds, making it ideal for machine tool spindles and other demanding equipment where precision and reliability are critical.
71920 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| AC | Angular Contact design with a 25° contact angle |
| D | Optimized internal design for high-speed operation |
| GA | Universal Matchable (SU) bearing, supplied in pairs with controlled axial clearance |
| P4A | Super precision tolerance class exceeding ABEC 7 standards |
71920 ACDGA/P4A Bearing Structural Features & Performance Benefits
High Precision & Rigidity: Manufactured to P4A tolerance class with bore and outside diameter tolerances of -0.004mm to 0, ensuring exceptional dimensional stability and precise shaft positioning. The 25° contact angle provides optimal axial load capacity while maintaining radial support.
High-Speed Capability: The phenolic resin cage offers excellent strength-to-weight ratio and smooth operation at the limiting speed of 15,000 rpm. The optimized internal geometry minimizes friction and heat generation.
Superior Load Capacity: With a dynamic load rating of 12,870 lbf and static load rating of 14,175 lbf, this bearing delivers reliable performance under significant axial and combined loads.
Universal Matching: Designed as Universal Matchable (SU) bearings, they can be supplied in pre-matched pairs (2 bearings per set) with controlled axial clearance for simplified installation and optimal preload configuration.
71920 ACDGA/P4A Bearing Typical Application Areas
- Machine Tool Spindles - High-precision machining centers and grinding machines
- Precision Instrumentation - Measuring equipment and optical devices
- High-Speed Motors - Spindle motors and high-frequency applications
- Aerospace Components - Guidance systems and auxiliary power units
- Medical Equipment - Dental handpieces and surgical tool rotors
