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.
M 14 1.25
With the help of Inch tap,scale and measuring tap ,one can measure window.This can be measured in inches,feet and meters.Generally MKS system is adopted at global level.because it has more accuracy.
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.
Here is the awnser to why Kevin Klutz Gave up Tap Dancing
1 1/4 is the rough hole size in most bathroom counter-tops.
It's done a few different ways, but the drawing will usually specify the hole size before tapping, the diameter and thread per inch of the tap, and the class of fit such as 1b, 2b, or 3b.
The hole would have no metal to cut the threads in if the hole were drilled the same diameter as the tap.
7/8 diameter drill or .875
To rethread a bolt hole, you can use a tap and die set. First, choose the correct size tap for the bolt hole. Then, insert the tap into the hole and turn it clockwise to cut new threads. Be sure to use lubricant to make the process easier. Once the threads are cut, you can test the bolt to ensure it fits properly.
acquire correct tap from hardware or automotive supplier. Drill smaller hole through EGR port boss on head. Drill larger hole , size stated on tap to same depth as on intake port. then tap. If metric thread tap cannot be acquired a tapered pipe thread tap will also work. Threads are very close and will seal because of taper.
Pick a tap size slightly larger than the existing hole. Make sure you have a screw that will fit it. Assemble the tap. Lubricate the hole with WD-40, oil, or some other appropriate proprietary formula. Place the tap in the hole and twist clockwise. Keep the tap straight and in line with the hole. Back out every few turns to remove any loose material. Once complete, clean the hole with compressed air or forced water to remove any lubricant and debris.
To rethread a stripped or damaged bolt hole, you can use a tap and die set. First, select the appropriate tap size for the bolt hole. Then, carefully thread the tap into the hole in a clockwise direction to create new threads. Be sure to use lubricant to make the process easier. Once the new threads are formed, you can test the fit with a bolt to ensure it is secure.
To re-thread a bolt hole, first clean the hole of any debris or old threads using a wire brush or tap cleaner. Then, select the appropriate tap size and type for the bolt you're working with. Insert the tap into the hole and turn it clockwise, applying steady pressure while ensuring it stays straight; use cutting oil for lubrication if necessary. Once the new threads are formed, remove the tap and clean the area again before inserting the bolt.
tap with the beginning tap clear swarf tap with the intermediate tap clear swarf tap with the plug tap clear swarf
It has got to be tapered to get in a fresh hole. Then you can finish it up with a square one to tap out the bottom of the hole.
It has got to be tapered to get in a fresh hole. Then you can finish it up with a square one to tap out the bottom of the hole.