More complete hole diameter comparison table of screw tapping drill, high-definition chart, pay close attention to t

　　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.Therefore, we should understand roofing screw Many benefits, absorb and summarize, and use them. https://www.hengkefasteners.com/

　　How to confirm the aperture size depends on the comparison table!