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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.