Not sure if this will help but - see the Article from Wikipedia in the attached link. There are various 'conversion tables' in there which might solve your question.
M 14 1.25
The instrument "Metalic tap" is generally used for length measurement in India
There are size on size weldolets. The hold on the run pipe will necessarily be undersize (either hot tap or torch ) because it's not possible to cut the same size hole in the run without damaging the base material.
In engineering you can use items around the workshop such as posters on info boards or their may already be drill and hole sizes for tap for example a 6.8mm drill bit for a M8 tap on a technical drawing or bend tolerences for the materials thickness.
For an M6 tap, a drill bit size of 5.0mm should be used.
For a cut tap the correct drill size is a #17 drill, which has a diameter of .173 inches.
The recommended drill size for tapping threads with an M3 tap is 2.5mm.
The recommended drill size for a 0-80 tap is 56.
The recommended drill size for tapping threads with an M3 tap is 2.5mm.
2,3mm
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?
Google "tap drill sizes" and you'll get 19400 results. The formula for that calculation is searchable in Machinery's Handbook, but there are simple charts you will get in your search that can give you the answer for any size you need to know.
1/8, tpi=28, pitch=0.0357, major dia.=0.383, minor dia.=0.3372, tap drill size=11/32 (8.73mm)
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.