The standard, managed by the Aerospace Industries Association (AIA), establishes a universal part-numbering system and symbols for solid rivets used in aerospace structures.
Direct conversions between military standards (MS), National Aerospace Standards (NAS), and Army-Navy (AN) part numbers. Best Practices for Shop Use
For flush riveting, the PDF includes the exact radius and depth of the 100° countersink. A mismatch between the rivet head and the countersink angle creates a stress riser. The NAS523 PDF includes go/no-go gauge dimensions. nas523 rivet code pdf
The NAS523 rivet code PDF covers several key components, including:
This upper-left quadrant contains a letter code that identifies the specific rivet part number (e.g., AN or MS series) and the material alloy. A mismatch between the rivet head and the
The NAS523 rivet code system represents an essential tool for aerospace engineers, draftsmen, and manufacturing professionals. Understanding how to interpret the four-quadrant code format—basic fastener code, diameter with head location, hole preparation, and length code—enables accurate specification and installation of rivets in aircraft structures. For complete information, obtaining the official NAS523-2014 (Revision 31) specification from an authorized distributor is strongly recommended. This document provides the comprehensive tables and definitions necessary for full implementation of the standard in real-world engineering applications.
4. Bottom-Right Quadrant: Maximum Flushness or Dimpling Instructions The NAS523 rivet code system represents an essential
This visual anchor allows mechanics on the assembly line to quickly scan a blueprint and know exactly which fastener goes into which pre-drilled hole without reading paragraphs of text. Why You Need the NAS523 PDF Reference Sheet
The bottom section defines the length of the rivet shank, or the maximum material thickness the rivet can securely fasten. This value is expressed in . Code 4: 4/16 inch (1/4 inch shank length) Code 7: 7/16 inch shank length Code 12: 12/16 inch (3/4 inch shank length) Decoding a Practical Example
While legacy drawings heavily utilize the graphical cross symbol, modern Computer-Aided Design (CAD) systems and digital Product Lifecycle Management (PLM) databases often convert the NAS523 symbol into a linear text string for easier searchability. A linear code might look like this: NAS523 : The governing standard. AD : 2117-T4 Aluminum alloy material. 4 : 4/32" (1/8") diameter. 6 : 6/16" (3/8") length. C : Countersunk installation requirement. Why You Need the Official NAS523 Rivet Code PDF
This quadrant identifies the specific standard or part number of the rivet. It tells the technician the exact geometry and head style (e.g., universal head vs. 100-degree countersunk).