This quadrant dictates the total length of the rivet. Rivet length is measured in .
Examples: (2117-T4 Aluminum alloy), D (2017-T4 Aluminum), DD (2024-T4 Aluminum), KE (7050 Aluminum), M (Monel). 3. Bottom-Left Quadrant: Rivet Diameter & Location
Understanding this code prevents catastrophic manufacturing errors. Using the wrong rivet material can cause galvanic corrosion, while incorrect sizing can lead to structural failure under stress. Structure of the NAS523 Rivet Code Symbol
For engineers, mechanics, and procurement specialists, having a chart is indispensable. Here’s why:
4. Bottom-Right Quadrant: Maximum Flushness or Dimpling Instructions nas523 rivet code pdf
The NAS523 system uses a cross-shaped or quadrant-based visual symbol on engineering drawings. It is divided into four distinct zones, usually structured around a central cross. Each quadrant delivers specific data:
: 2024-T4 Aluminum (high strength, also an "icebox" rivet).
The core of the callout designates the standard design of the rivet, which dictates the head style (e.g., universal head vs. countersunk) and the manufacturing specification. : Universal head rivets (protruding). MS20426 / NAS1097 : 100-degree countersunk flush rivets. 2. The Material Code (The Letter Designation)
Disclaimer: Aerospace standards (NAS, AN, MS) are copyrighted specifications controlled by standards organizations (like AIA/SAE). While you can find "guides" based on these standards, the official PDFs usually require a license to access legally. This quadrant dictates the total length of the rivet
The most valuable content in a NAS523 PDF is the decoding of . In aerospace, you cannot always rely on the color of the metal to identify a rivet, because aluminum alloys can look identical to the naked eye. Manufacturers stamp the head with specific patterns.
On technical aerospace blueprints, the NAS523 code is represented visually using a standardized cross symbol.
: The FAA's AC 43.13-1B provides general hardware identification that supplements NAS523 knowledge . NAS523 Rivet Identification Guide | PDF - Scribd
On aerospace blueprints, the NAS523 code is frequently presented as a cross (quadrant symbol). Each quadrant of the cross contains specific information about the fastener's characteristics and installation requirements. Structure of the NAS523 Rivet Code Symbol For
Disclaimer: Always refer to the latest manufacturer maintenance manual (AMM) or structural repair manual (SRM) for specific aircraft, as procedures can change. If you'd like, I can: Find a of the standard Explain how to read a specific four-quadrant symbol Detail the difference between AN and MS rivets Let me know how you'd like to narrow down the topic . NAS523 Rivet Identification Guide | PDF - Scribd
: Letters like D (Dimpled), C (Countersunk), or F (Far side) tell the technician how to prepare the sheet metal substrate before driving the fastener. Linear Representation on Modern Blueprints
: A number 6 in this quadrant indicates a rivet length of 6/16" (or 3/8").
The final number indicates the length of the rivet shank, measured in . -4 = 4/16" (or 1/4") length -6 = 6/16" (or 3/8") length -8 = 8/16" (or 1/2") length The NAS523 Rivet Symbol on Blueprints
Official, unedited copies of the NAS523 standard can be purchased directly via the Aerospace Industries Association (AIA) or authorized distributors like IHS Markit and SAE International. For study and field maintenance, major aviation universities and military technical manuals (like NAVAIR or FAA Advisory Circular AC 43.13-1B) include detailed variations of these cross-reference charts in PDF format. Summary Cheat Sheet for Field Mechanics