Standard metric nut tapping needs to drill a hole smaller than the thread diameter to tap. The size of this hole is from the thread minor diameter to the thread middle diameter.However, in other words, we should know more about it. deck screw The law of development has brought new vitality to the whole industry and revitalized the market. https://www.hengkefasteners.com/
How to confirm the aperture size depends on the comparison table!