The document applies to attribute inspection of fasteners (screws, bolts, rivets, nuts). It does not cover variable data (like tensile strength) but focuses on "go/no-go" criteria: thread defects, plating flaws, head cracks, and length deviations.
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When ordering or referencing a NAS523 in a PDF catalog or bill of materials, the part number is determined by a dash number indicating the size and grip length. nas523 pdf top