71806 ACD/P4DBB

The model number 71806 ACD/P4DBB is decoded as follows:

• 71806: Basic bearing series, indicating a light series, 30mm bore diameter angular contact ball bearing.
• A: Denotes a 25° contact angle, optimized for carrying significant axial loads.
• C: Indicates the bearing is supplied with a light preload (Class B).
• D: Specifies that the bearing is part of a duplex pair.
• P4: The tolerance class, signifying very high precision for dimensions and running accuracy.
• DBB: Defines the matched arrangement as Back-to-Back (DB). This arrangement provides high moment rigidity and is optimal for applications with overturning moments.

The performance of the 71806 ACD/P4DBB is a direct result of its sophisticated design:

• High Rigidity & Load Capacity: The back-to-back duplex arrangement creates a wide, stable support system that significantly increases rigidity and enables the bearing set to handle substantial combined radial and axial loads from both directions.
• Precision & High-Speed Performance: Built to P4 tolerance class with a phenolic resin cage, this bearing ensures minimal vibration and low rotational torque, contributing to its high limiting speed of 100,500 rpm.
• Optimized Contact Angle: The 25° contact angle is specifically chosen to provide an excellent balance between radial and axial load-carrying capacity.
• Light Preload: The factory-set light preload (Class B) eliminates internal clearance, ensuring precise shaft positioning, reduced noise, and enhanced system stiffness from start-up.

This high-precision, high-rigidity bearing set is designed for demanding applications, including:

• Machine Tool Spindles (e.g., for milling, grinding, and turning centers)
• High-Frequency Spindles
• Precision Gearboxes
• Robotic Drives and Actuators
• Medical and Dental Equipment
• Optical and Measuring Instruments