Knowing what I know re DPT and correct machine process standard ISO test nuts will always be used to check threading, even on a CNC there is the opportunity for Machining to be undersized or oversized due to wear, lack of lubricant heat or lack of etc, there are many variables and on that note it’s hard to do any better than accurately ‘guess’ what a thread is without seeing it accurately measured. I have plenty of thread gauges here happy to send out a couple...
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