71905 ACDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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71905 ACDGA/P4A Bearing Product Overview & Core Advantages
The 71905 ACDGA/P4A is a single-row angular contact ball bearing engineered for applications demanding ultra-high precision and exceptional rotational accuracy. Operating under a P4A tolerance class, it is designed to handle significant axial loads in one direction, making it ideal for high-speed spindles and precision machinery. Its compact cross-section, combined with a phenolic cage and universal matching capability, provides a reliable solution for complex, high-performance bearing arrangements requiring minimal friction and excellent dimensional stability.
71905 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
- 71905: Basic designation denoting a light series, 25mm bore angular contact bearing.
- AC: Angular Contact design with a 25° contact angle.
- D: Signifies a high ball complement for increased load capacity.
- GA: Indicates the bearing is supplied with a light preload (Extra light / Class A).
- P4A: Denotes an ultra-precision tolerance class with enhanced running accuracy and dimensional control.
71905 ACDGA/P4A Bearing Structural Features & Performance Benefits
The performance of the 71905 ACDGA/P4A is driven by its specific construction:
- High-Speed Capability: The lightweight phenolic resin cage minimizes centrifugal forces and friction, enabling a high limiting speed of 53,000 rpm. This is critical for spindle applications.
- High Load Capacity: The 25° contact angle and high ball complement (D) are optimized to support substantial axial loads while maintaining radial load capacity.
- Ultra-Precision Operation: Manufactured to P4A tolerance class, this bearing ensures minimal runout and superior dimensional accuracy, contributing to the overall precision of the host system.
- Universal Matching: Designated as Universal Matchable (SU), these bearings can be precisely paired in sets (up to 4) to achieve specific preloads and stiffness characteristics without selective mounting.
71905 ACDGA/P4A Bearing Typical Application Areas
The 71905 ACDGA/P4A is ideally suited for high-precision, high-speed machinery, including:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Grinding Spindles
- High-Frequency Motors
- Dental and Medical Handpiece Drives
- Aerospace Instrumentation and Gyroscopes
