/ AD : 2117-T4 Aluminum Alloy (Dimpled head, the most common structural rivet).
Engineers and sheet metal technicians frequently look for the "top" or most reliable NAS523 PDF references because misinterpreting a single letter in a rivet code can lead to using the wrong material (e.g., substituting an aluminum rivet where a titanium or monel rivet is required), jeopardizing the aircraft's structural strength. Anatomy of an NAS523 Rivet Code
Without an official, up-to-date copy of NAS523, you cannot guarantee that the fastener codes on your drawings will be interpreted correctly by mechanics, inspectors, or suppliers.
: Remember that for countersunk (flush) rivets, the length includes the head. For universal (protruding) head rivets, the length is measured from the bottom of the head to the end of the shank. Your reference PDF should clearly illustrate these measurement boundaries. nas523 pdf top
The lower-right corner specifies the length of the fastener, measured in 1/16" increments. A "-6" indicates a inch long rivet. Importance of the NAS523 PDF Top Standard
The NE quadrant determines the structural thickness of the rivet shank and dictates which side of the aircraft structure the manufactured head must reside.
Overall, I would rate the NAS 523 PDF as follows: / AD : 2117-T4 Aluminum Alloy (Dimpled head,
Indicates the fastener's basic part number (e.g., AN or MS) and its material composition. For example, the code "BJ" identifies an MS20470AD universal-head rivet made of 2117-T3 aluminum alloy.
North (N) | NW | NE (Part #) | (Diameter) | (& Placement) -----------+----------- West (W) to East (E) | SW | SE (Hole | (Length) Prep) | | South (S) 1. Northwest Quadrant (NW): Part Number and Material
The NAS523 specification is the aerospace standard for . Specifically, it dictates the head markings and codes used to identify blind rivets and solid rivets in aircraft construction. Because structural integrity is paramount in aviation, knowing how to interpret these markings is a critical skill. : Remember that for countersunk (flush) rivets, the
The NAS523 represents a specialized evolution of the structural screw. By combining with a reduced diagonal head geometry , it solves the engineer's dilemma of fitting high-strength fasteners into confined spaces. It remains a staple in the aerospace supply chain, identifiable by its distinct head shape and the "NAS" prefix guaranteeing aerospace-grade pedigree.
Contains informational guides regarding NAS523 rivet identification, though not the official standard document.