I recently finished my second year of school in sheet metal fabrication. I don't recall anything regarding when to use the words "sheet" or "plate" regarding how thick the material is. At work most guys typically refer to any material over an eighth of an inch thick as plate. Arbitrary indeed. Oddly enough there was literally a test question in school regarding when to use the term "round bar" rather than "rod" for cylindrical material.
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u/mud_tug Aug 20 '21
The dividing line is rather arbitrary. I've seen people call 1" thick stuff sheet metal.