8mm tap question?

richirich · Sep 24, 2011

I am going to attempt to tap out a stripped 6mm head bolt to 8mm.
I have a brand new 8mm x 1.25 tap but am unsure what size drill bit i need to drill the case before i try tapping it.
Thanks for the info

GearNut · Sep 24, 2011

Drill bit size K or I depending on the thread pitch.
Drill and tap size chart - Wikipedia, the free encyclopedia

Look about 2/3 the way down on the chart. Metric sizes are all in purple.

richirich · Sep 24, 2011

thanks for the info

richirich · Sep 25, 2011

actually the chart was incomplete. it had the size for the 8mm 1.00 thread pitch but not the 1.25 pitch. Ill keep looking

Al.Fisherman · Sep 25, 2011

richirich said:
actually the chart was incomplete. it had the size for the 8mm 1.00 thread pitch but not the 1.25 pitch. Ill keep looking

Bolt Depot - Metric Tap and Drill Size Table

Found in 10 seconds....It's amazing at how to look these things up.

GOOGLE... "drill for 8 X 1.25 bolt" 6.9mm or 11/64th

richirich · Sep 25, 2011

Thanks Al , that was exactly what i needed. Sorry, though sometimes we overlook the obvious.

GearNut · Sep 25, 2011

richirich said:
actually the chart was incomplete. it had the size for the 8mm 1.00 thread pitch but not the 1.25 pitch. Ill keep looking

Look 4 lines above the listing for M8x1.0.
It's a moot point now though, Al.Fisherman got it for you too.

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8mm tap question?

richirich

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GearNut

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richirich

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richirich

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Al.Fisherman

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richirich

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GearNut

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