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If you are looking to secure a copy of the official standard, there are a few primary ways to access it: 1. Professional Database Services

Provides details for dimpling or countersinking. This section instructs the technician on exactly what type of prep work is required for the installation.

NAS523 PDF – Top Resources & Key Spec Overview

A typical code following this standard often looks like a four-quadrant cross or a specific string of characters (e.g., ). Each position in the code represents a specific attribute:

: Corresponds to an MS20470AD (or AN470AD) universal-head rivet fabricated from 2117-T3 aluminum alloy.

When users search for "NAS523 PDF Top," they are usually looking for the . This specific section of the PDF chart defines the "Head Style" and "Fastener Series."

Indicates the shank diameter, usually in increments of 1/32 of an inch.

: For definitive information on purchasing or licensing the most current revision, your best course of action is to contact the Aerospace Industries Association of America Inc. directly. Their official contact has historically been 1250 Eye Street, NW, Washington, DC 20005-3922.