Specify if you're working on a (like Boeing or Airbus).
The National Aerospace Standard (NAS) 523 was developed to simplify the complex world of fastener identification. In aircraft manufacturing, a single wing might require thousands of rivets of varying materials, diameters, and head styles. Instead of listing exhaustive part numbers on every blueprint, engineers use the NAS523 code—often visualized as a "cross" or "diamond" symbol on engineering drawings. How to Read the NAS523 "Top" Code nas523 pdf top
Indicates the rivet diameter in 1/32-inch increments. Specify if you're working on a (like Boeing or Airbus)
5056 Aluminum Alloy (Used primarily with magnesium structures). KE: 7050 Aluminum Alloy. Why You Need the Official PDF Instead of listing exhaustive part numbers on every
Denote the length and whether the fastener is driven on the near or far side. Common NAS523 Material Codes
Designates the basic part number or material (e.g., "BJ" for a specific solid rivet).
I can then provide the specific technical details associated with that portion of the NAS523 standard.