5056 rivets are softer than 2017 or 2024. The PDF chart provides minimum double-shear strength (in lbs). NAS523-6 might shear at 380 lbs, while a same-size 2017 would be 520 lbs. Do not substitute without engineering approval.
In the world of aviation fasteners, the standard is the Rosetta Stone. It provides the standardized code system used to identify rivets and fasteners across the industry. nas523 rivet code pdf
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If you see a purple rivet on a magnesium aircraft skin (common in older Cessnas, Pipers, or helicopter tail booms), you can safely assume it is a NAS523 rivet. Substituting a blue (2024) or yellow (2017) rivet could lead to catastrophic corrosion within months. Do not substitute without engineering approval
identifies a standard MS20470AD universal-head rivet made from 2117 aluminum alloy. Northeast (NE - Upper Right): Specifies the rivet diameter
In aerospace structural assembly, refers to a specific type of solid rivet with a protruding head (universal head) and a standard shank. The "code" associated with NAS523 rivets is actually a part numbering system that encodes diameter, length, and material.