It sounds like you’re looking for an of the NAS523 rivet code (likely from a PDF source), rather than the PDF file itself.
For full technical specifications and a complete listing of letter codes, you can consult these resources: NAS523 Rivet Identification Guide : A detailed 4-page guide is available via Scribd (NAS523 Guide) Fastener Design Manual : While more general, the NASA Technical Reports Server provides extensive data on rivet selection and strength. Aircraft Standard Handbook : Chapter 10 of this Aircraft Standard Handbook covers marking holes according to NAS523 codes. material code (like BJ, BB, or AD) to identify a particular rivet? NAS523 Rivet Identification Guide | PDF - Scribd nas523 rivet code pdf
This system was adopted by nearly every major aircraft company (Boeing, Airbus, etc.) because it prevents catastrophic errors during repairs. For instance, mistaking a 2117 alloy rivet for a weaker one could lead to structural failure under the extreme stress of flight. It sounds like you’re looking for an of