"Cordless Crazy" wrote in message
...

If I want to form a M8 thread in a piece of sheet steel, what size hole
do I initially drill?

I am thinking 2mm less or is that too much?

Would that make it a 6mm hole?!?

Sorry it's not an exact answer, but from what I remember from my distant
days at BT Fulcrum, it is certainly no greater than a mm. But don't take my
word for it - try it out, but don't force the tap if the hole is too small,
as they are very brittle.

-- JJ