Pdf | Nas523

The core of the NAS523 system is a where each quadrant represents a specific piece of information. Designation Information Provided Top-Left NW (Northwest) Rivet Type/Part Number (represented by a 2-letter code) Top-Right NE (Northeast) Rivet Diameter (in 1/32" increments) and Head Location Bottom-Left SW (Southwest) Countersink/Dimple requirements or specialized instructions Bottom-Right SE (Southeast) Rivet Length (in 1/16" increments) 2. Decoding the Quadrants Northwest (NW): Rivet Material & Type

Here’s a general structure you can use: nas523 pdf

The standard includes universal heads (strongest general purpose) and countersunk heads (used for low-drag applications). Reference Resources The core of the NAS523 system is a

The PDF contains detailed tables for various dash numbers. For example, a typical NAS523 washer will specify: Reference Resources The PDF contains detailed tables for

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A "captive" washer (NAS523) is pre-assembled onto the screw or bolt and cannot be removed without damaging it. A "free" washer (like AN960) slides on and off. Do not substitute one for the other; captive washers are used for high-vibration environments like engine cowlings.