Nas523 Rivet Code Pdf 2021 -

2117 aluminum alloy, identified by a single dimple on the head; these are "field rivets" that do not require heat treatment.

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Do not rely on fragmented forum posts. Purchase or download an official NAS523 PDF from a certified standards body today, and laminate the identification chart for your hangar wall. Your aircraft’s structural integrity depends on it. 2117 aluminum alloy, identified by a single dimple