Does anyone know what the "flat" or "blunt" lead thread on a plug gage is called? Why is it blunt and not tapered like a normal bolt or screw?
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Does anyone know what the "flat" or "blunt" lead thread on a plug gage is called? Why is it blunt and not tapered like a normal bolt or screw?
Bottoming Tap or Bottom Tap...
These are used to cut threads close to the bottom of the tap-drilled hole.