is a standardized Fastener Code system established by the National Aerospace Standards Committee (NAS) to provide a universal symbolic language for identifying permanent fasteners, primarily rivets, on aerospace blueprints and engineering drawings. The code is designed to fit complex data—such as part numbers, diameters, material alloys, and specific installation requirements—into a single, four-quadrant symbol often referred to as the "rivet cross". The NAS523 Symbolic System
The "Top" position of the NAS523 symbol is the most critical. It typically indicates the or the specific material and type of the fastener. nas523 pdf top
A genuine, high-quality (top-tier) PDF of NAS523 is not just a scan; it is a technical tool. Here is what you will find inside the 20+ page document: NAS523 is a standardized Fastener Code system established
General hardware identification and customer specifications can be cross-referenced through Verus Aerospace documents. Key Identification Markers Rivet Type Head Marking 1100 Aluminum AD Dimple (Single) 2117-T3 Aluminum D Raised Dot 2017-T Aluminum DD Two Raised Dashes 2024-T Aluminum ("Icebox" rivets) NAS523 Rivet Identification Guide | PDF - Scribd Illegible Tables: Many older scans are 72 DPI photocopies