The print says M8 in a table and does not give a class. We assumed 6H. The gauge they used on incoming is a tighter gauge and two holes fail. The quote did not mention class.
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M8 with no class is incomplete. Quote 6H unless they specify, and write 'threads to 6H' on the quote. A silent assumption is invisible on the PO.
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On this lot, gauge with a 6H plug and report those results beside theirs. If their gauge is a special, they need to send it or specify it. You cannot hit a gauge you were not given.
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A thread that fails a mystery gauge is not automatically scrap. It is a specification gap. Close it before you retap the lot.
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