Aeroquip FCM3555 #4 AN Aluminum Tube Nut, Blue Anodized, Set of 6

The Aeroquip FCM3555 #4 AN aluminum tube nut is designed for secure, reliable connections in compatible high-performance fluid systems. This tube nut fits 1/4-inch tubing and is suitable for use with compatible -4 AN fittings, helping create a properly assembled connection for automotive, motorsport, racing, and custom plumbing applications. Its blue anodized finish provides a clean appearance while helping protect the aluminum surface during regular use.
The Aeroquip FCM3555 is manufactured from lightweight aluminum to support weight-conscious installations without sacrificing practical connection performance. The precision-style tube nut design allows for straightforward installation when paired with the correct tubing, sleeve, and fitting components. Always verify thread compatibility and assembly requirements before installation to ensure a leak-resistant system.
This set includes six Aeroquip #4 AN tube nuts, making it a convenient choice for multi-point installations, replacement projects, or maintaining spare connection hardware. The compact format is well suited to fuel, oil, coolant, brake, and other compatible fluid-system applications where properly matched AN components are required. Use this Aeroquip part only within the pressure, temperature, and fluid compatibility limits of the complete system.

Features:

• Brand: Aeroquip

• Part Number: FCM3555

• Fitting Type: Tube nut

• AN Size: #4 AN

• Tube Compatibility: 1/4-inch tubing

• Material: Aluminum

• Finish: Blue anodized

• Quantity: Set of 6

• Application: Compatible automotive, motorsport, racing, and custom fluid-system installations