Since NAS523 is no longer maintained by AIA (and not sold as an active document), many seek free or archived PDF copies online. Caveat: Unofficial copies may lack revision status or contain errors.
NAS523 Rivet Identification Guide | PDF | Rivet | Sheet Metal - Scribd
is a National Aerospace Standard that establishes the requirements for solid rivets used in the construction of aircraft and spacecraft. Specifically, it is titled "Rivets, Unified Standard."
Even experienced quality managers make errors regarding this standard. Avoid these pitfalls:
They spoke for hours, Elias asking questions only someone once alive could ask — about the texture of rain, the weight of apology — and Kira answering with the blunt practicality of someone used to designing systems. With each answer, the ghost refracted differently. Sometimes it was Elias' old mischief; sometimes it was a composite made of snippets from message boards and commit logs. It learned not by the mystical assimilation Elias had once imagined, but by statistical accretion: the more Kira fed it, the more it could refine the edges of what it was.
Represented by a number indicating 1/32-inch increments (e.g., a "3" means 3/32" diameter).