71911 ACBGA/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 ACBGA/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a single bearing with an extra light preload (Class A), it offers minimal friction and optimal running precision. Its 25° contact angle is engineered to support significant combined loads, handling both radial and axial forces simultaneously. Manufactured to the stringent P4A tolerance class, this bearing ensures superior dimensional stability and is universally matchable (SU), allowing for precise axial play adjustment when paired with another bearing. This makes it an ideal solution for high-reliability, high-precision machinery.
71911 ACBGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71911 | Basic bearing series and size designation (55mm bore, 80mm OD). |
| AC | Angular Contact design, optimized for combined loads. |
| B | 40° contact angle (standard for this series). |
| GA | Universal Matchable bearing. Can be mounted in any combination to achieve a specific preload. |
| P4A | Super Precision tolerance class, exceeding ABEC 7/ISO P4 standards for enhanced running accuracy. |
Structural Features and Performance Benefits
The performance of the 71911 ACBGA/P4A is derived from its advanced construction:
- High-Speed Capability: The lightweight phenolic resin cage minimizes centrifugal forces and friction, enabling a high limiting speed of 34,000 rpm. The open seal type further reduces friction for maximum speed potential.
- Exceptional Rigidity and Accuracy: Manufactured to P4A tolerances with an extra light preload, this bearing provides high system stiffness and minimizes runout, which is critical for applications like machine tool spindles.
- Superior Load Capacity: The 25° contact angle and optimized internal geometry allow it to efficiently support combined radial and axial loads. It has a dynamic load rating of 2106 lbf and a static load rating of 1721 lbf.
- Premium Materials: Rings and balls made from high-grade chrome steel ensure excellent durability and fatigue resistance under demanding operating conditions.
71911 ACBGA/P4A Bearing Typical Application Areas
This precision bearing is engineered for high-performance applications where speed, accuracy, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: Measuring devices, optical scanners, and coordinate measuring machines (CMM).
- High-Speed Motors and Spindles: Electric motors, PCB drilling spindles, and dental handpieces.
- Robotics: High-accuracy joints and actuators.
