: Dictates the physical modifications required on the skin panels to achieve flush or specific fit installations. Common codes include C for countersinking, D for dimpling, and complex sequences like D2C (dimple the top two sheets, countersink the third underlying sheet).
Accessing the official is vital for quality control. The document provides the authoritative, authorized breakdown of the identification codes.
The most referenced page in the PDF is . This table cross-references: nas523 pdf top
: 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.
Details special installation methods . This often includes instructions for dimpling ("D") or countersinking ("C"). : Dictates the physical modifications required on the
Here are the top 5 reasons to choose the NAS523 PDF Top:
Because full part numbers like MS20470AD are too lengthy for a schematic diagram, NAS523 substitutes them with a standardized . For universal (protruding) head rivets, the length is
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The document applies to of fasteners (screws, bolts, rivets, nuts). It does not cover variable data (like tensile strength) but focuses on "go/no-go" criteria: thread defects, plating flaws, head cracks, and length deviations.
Some engineering universities license the AIA standard set. Students or research staff may access the NAS523 PDF for free.