71907 ACD/P4AQBTC

The model number 71907 ACD/P4AQBTC provides a detailed technical specification:

• 71907: Basic bearing series, indicating a high-precision angular contact design with a 35mm bore, 55mm OD, and 40mm width.
• ACD: Angular Contact design with a 25° contact angle.
• P4A: Ultra-precision tolerance class, exceeding ABEC 7 standards for exceptional running accuracy.
• QBT: Quadruplex Tandem Back-to-Back matched arrangement. This indicates the bearing is one of four in a set, pre-configured to work in tandem for maximum rigidity.
• C: Denotes the Moderate preload level applied to the matched set.

The design of the 71907 ACD/P4AQBTC delivers distinct performance advantages:

• Exceptional Rigidity & Load Capacity: The Quadruplex Tandem Back-to-Back (QBT) arrangement creates an extremely rigid bearing system capable of withstanding heavy combined radial and axial loads from both directions. The 25° contact angle is optimized for sustaining high axial loads.
• High-Speed Capability: The lightweight and robust phenolic resin cage ensures stable operation and reduced centrifugal forces, contributing to a high limiting speed of 56,000 rpm. The open design facilitates efficient lubrication management.
• Ultra-Precision Performance: Manufactured to P4A tolerance class with tight dimensional control on the bore diameter, outside diameter, and width, this bearing guarantees minimal runout and vibration for superior application accuracy.
• Matched Set Reliability: Supplied as a pre-matched set of four, these bearings are manufactured to work in perfect unison, eliminating performance variations and simplifying installation for critical spindle assemblies.

This high-precision, high-rigidity bearing is specifically suited for advanced machinery where accuracy and stability are paramount. Key applications include:

• High-Frequency Machine Tool Spindles
• Precision Grinding Spindles
• High-Speed Machining Centers
• Advanced Robotic Drives and Actuators
• Aerospace and Defense Positioning Systems