71911 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 71911 ACDGA/P4A is a single-row angular contact ball bearing designed for applications requiring ultra-high precision and exceptional rotational accuracy. Positioned in the P4A tolerance class, this bearing delivers superior dimensional stability and running accuracy. Its 25° contact angle is optimized to handle significant combined loads (radial and axial) simultaneously. The extra light preload (Class A) ensures minimal deflection under operational stresses, making it ideal for high-speed spindle applications where rigidity and precision are paramount. Manufactured from chrome steel and featuring a phenolic cage, it offers excellent durability and performance in demanding environments.
71911 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| 71911 | Basic designation: 55mm bore, 80mm OD, 13mm width |
| AC | Angular Contact design with 25° contact angle |
| D | High ball diameter and quantity for increased load capacity |
| GA | Universal Matchable (SU) - can be paired in sets for preload optimization |
| P4A | Super precision tolerance class with enhanced running accuracy |
Structural Features and Performance Benefits
Precision Engineering: The P4A tolerance class ensures minimal dimensional variation and exceptional running accuracy, critical for high-speed applications.
Optimized Load Distribution: With a 25° contact angle and 23 balls of 7.938mm diameter, the bearing efficiently handles combined radial and axial loads while maintaining stability.
High-Speed Capability: The phenolic cage provides excellent strength-to-weight ratio, contributing to the limiting speed of 46,000 rpm and reduced centrifugal forces.
Rigidity and Accuracy: Extra light preload (Class A) minimizes deflection under load, ensuring consistent performance and positioning accuracy in precision machinery.
Universal Matching: Designed as Universal Matchable (SU), these bearings can be supplied in matched sets of 3 for optimized preload and stiffness in multi-bearing arrangements.
71911 ACDGA/P4A Bearing Typical Application Areas
- Machine Tool Spindles - High-speed machining centers and grinding spindles
- Precision Instrumentation - Measuring equipment and optical devices
- Medical Equipment - Dental handpieces and surgical tools
- Aerospace Systems - Gyroscopes and navigation equipment
- Semiconductor Manufacturing - Wafer handling and positioning systems
