Pdf — Nas523

The NAS523 Rivet Code is a standardized identification system used in the aviation industry to concisely provide detailed specifications for rivets on engineering drawings and technical diagrams. Instead of writing out full part numbers, a single four-quadrant "crosshair" symbol is used to indicate the rivet's type, diameter, manufacturer’s head location, and length. 1. Understanding the NAS523 Symbol Structure

• Aluminum Alloys (e.g., 2017, 2024, 2117, 5056)
• Corrosion-Resistant Steel (Stainless Steel)
• Monel (Nickel-Copper Alloy)

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• Copyright: The official NAS523 standard is copyrighted by the Aerospace Industries Association (AIA). It is not typically available as a free, open download legally.
• Where to find it:

  5. Why is it Important?

  In aerospace, precision is paramount. A rivet that is slightly too short may not form a proper "shop head" (the flattened end created during installation), leading to structural failure. A rivet that is too long might buckle during installation. NAS523 ensures that regardless of the manufacturer, a specific part number will have the exact same dimensions and strength properties. The NAS523 Rivet Code is a standardized identification

  Diameter: Represented by a number indicating 1/32-inch increments (e.g., a "3" means 3/32" diameter). Aluminum Alloys (e

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  Northwest (NW) Quadrant: Identifies the fastener type or material using a two or three-letter code (e.g., "BJ" for MS20470AD or "BB" for MS20426AD).