The NAS6704-U1 is an aerospace-standard high-strength hex head tension bolt from the NAS6704 series, used in structural aircraft assemblies where precise fit, high tensile strength, and vibration resistance are required. It is designed as a close-tolerance fastener with a controlled shank and threaded section to ensure accurate load transfer in shear and tension applications.

This bolt is typically made from high-strength aerospace alloys (such as A286 stainless or Alloy 660 depending on configuration) and is engineered for demanding environments involving cyclic loading, vibration, and temperature variation. The “U” configuration generally indicates a specific surface treatment or finish variant within the NAS code system.

NAS6704 bolts are commonly used in airframe structures, wing assemblies, engine mounts, and other critical structural joints where reliability and certification compliance are required.

Key features include:

NAS6704-U1 aerospace tension bolt
High-strength structural fastener (NAS series)
Designed for shear and tension load applications
Close-tolerance shank for precise fit
Hex head design for standard installation tools
Aerospace-grade alloy construction (A286 / Alloy 660 variants)
Corrosion-resistant aviation finish (variant-dependent)
Suitable for vibration and cyclic load environments
Used in airframe and structural assemblies
Direct replacement per NAS/MS aircraft standards