The code clarifies if the rivet is a universal head (protruding) or countersunk (flush).
Be wary of sites offering the NAS523 PDF for free. They often host outdated revisions (from the 1990s) riddled with OCR errors. If a tank line fails because you misread a titration value from a corrupted scan, the cost of scrap parts will far exceed the price of the standard. nas523 pdf top
The revisions to look for in your PDF search are: The code clarifies if the rivet is a
The code clarifies if the rivet is a universal head (protruding) or countersunk (flush).
Be wary of sites offering the NAS523 PDF for free. They often host outdated revisions (from the 1990s) riddled with OCR errors. If a tank line fails because you misread a titration value from a corrupted scan, the cost of scrap parts will far exceed the price of the standard.
The revisions to look for in your PDF search are: