71909 CB/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71909 CB/P4A Bearing Product Overview & Core Advantages
The 71909 CB/P4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. This metric precision bearing is distinguished by its P4 (ABEC-7) tolerance class, ensuring minimal runout and superior performance. Its key advantage lies in its ability to accommodate high combined loads, particularly substantial axial loads in one direction, making it an ideal solution for machine tool spindles and other high-speed, high-rigidity systems. The phenolic cage and optimized internal geometry contribute to its outstanding high-speed capabilities.
71909 CB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71909 | Basic bearing series, indicating a light series, 45mm bore, 68mm OD, 12mm width. |
| CB | Specific internal design with a 15° contact angle and modified internal clearances/geometry, optimized for preload when used in a matched arrangement. |
| P4A | Indicates a P4 tolerance class (equivalent to ABEC-7) with tolerances tighter than normal P0 class. The 'A' suffix may denote specific tolerance deviations or special requirements. |
71909 CB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: Manufactured to P4 tolerance class with a 15° contact angle, this bearing provides high axial rigidity and precise running accuracy, essential for applications like machine tool spindles.
- Superior Load Capacity: The optimized raceway geometry and high-grade chrome steel construction enable it to handle significant combined radial and axial loads.
- Optimized High-Speed Performance: The lightweight phenolic resin cage ensures excellent dimensional stability and low friction at high speeds, supporting a limiting speed of 43,000 rpm.
- Preload and Matched Sets: The CB designation signifies the bearing is supplied with specific internal clearances suitable for applying preload, which increases system stiffness and reduces vibration. It is designed to be used in matched arrangements for duplex mounting (e.g., DB, DF, DT).
71909 CB/P4A Bearing Typical Application Areas
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Spindles for PCB drilling and routing
- High-Frequency Motors
- Robotic Arms and Actuators
- Medical and Dental Equipment (e.g., High-speed handpieces)
