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macafee2 · 23rd April 2020, 09:34

The correct drill size for a 6mm tap is 5.2mm. As a decimal this is 0.2047.
My nearest drill bit is 13/64 which is 0.2031 a difference of 0.0016.

Will the hole be just that bit too small or does it more depend on the quality of the tap, I.E it does not snap due to being too tight?

Some drill bits are advertised as 5.2mm 13/64 but my Zeus book shows these are different sizes.

macafee2

23rd April 2020, 09:34	#1
macafee2 This is my second home Rover 75 Saloon & Tourer Join Date: Sep 2012 Location: Lincoln Posts: 14,929 Thanks: 1,630 Thanked 3,032 Times in 2,181 Posts	Question for the enginners, 0.0016mm The correct drill size for a 6mm tap is 5.2mm. As a decimal this is 0.2047. My nearest drill bit is 13/64 which is 0.2031 a difference of 0.0016. Will the hole be just that bit too small or does it more depend on the quality of the tap, I.E it does not snap due to being too tight? Some drill bits are advertised as 5.2mm 13/64 but my Zeus book shows these are different sizes. macafee2 Last edited by macafee2; 23rd April 2020 at 09:38..