71909 CD/P4ADBA

• 71909: Basic series designation, indicating a metric, angular contact ball bearing with a 45mm bore.
• C: Represents a 15° contact angle, optimized for high-speed operation and moderate axial loads.
• D: Indicates the bearing is part of a duplex pair (two bearings).
• P4A: Denotes an ultra-precision tolerance class with specific runout and dimensional controls exceeding standard P4 levels.
• DB: Specifies the matched arrangement as Back-to-Back. This configuration provides high moment rigidity and excellent stability under complex loads.
• A: Indicates an Extra Light preload within the matched set, minimizing friction and heat generation at high speeds while maintaining system stiffness.

The 71909 CD/P4ADBA's design delivers distinct performance advantages:

• High Rigidity & System Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, crucial for maintaining precision in machining applications.
• Superior Precision: Manufactured to a P4A tolerance class, this bearing guarantees extremely tight dimensional and running accuracy, contributing to improved machine performance and finish quality.
• Optimized High-Speed Performance: The 15° contact angle and phenolic resin cage work in tandem to reduce centrifugal forces and friction, enabling smooth operation up to the specified limiting speed of 41,000 rpm.
• Pre-Lubricated for Immediate Use: The bearing comes lubricated from the factory, ensuring optimal performance from initial startup and simplifying the installation process.

This high-precision duplex bearing is engineered for advanced machinery where accuracy and speed are paramount. Key applications include:

• Machine Tool Spindles: High-speed milling, grinding, and turning centers.
• Precision Spindles: PCB drilling machines, high-frequency motor spindles.
• Robotics: High-accuracy joints and actuators.
• Medical Equipment: Dental handpieces and laboratory automation systems.