I would use an 18mm or 23/32 drill bit, in general, although it does partly depend on the thread type ( UNF, UNC etc) and the material .
For an M6 tap, a drill bit size of 5.0mm should be used.
It is not a drill bit, it is called a Tap. You drill a hole slightly smaller than the Tap and then screw it into the hole.
2,3mm
No, you need a special tool with 2 points that lodge in the flutes of the tap.
Your meaning is not clear. - If you are going to tap the threads in, use a 7/32 drill bit. If you want a hole that this bolt will slip through, use a 9/32 drill bit.
Use 7/64 as tap drill and 9/64 as clearance drill
Drill Jigs are used to tap holes.
Drill and tap it for what?
For a 6-48 tap, a #43 drill bit is typically used. This size provides the appropriate clearance for the threads created by the tap. It's important to ensure proper sizing for effective tapping and to avoid damaging the material. Always check specific tapping guidelines for the material being worked on, as recommendations may vary slightly.
A 20mm or 13/16 drill bit will allow the bolt to fit through.
You drill the bolt out that is snapped off in the engine,with drill bit made to drill through metal. Then use a thread maker,tap. Auto parts stores carry these. I no u can get at autozone. The tap makes new threads.
I use a 3/8 bit for tapping fine thread, or a 11/32 for coarse threads.