Thread tolerance

No, you don't have two tolerances, once you satisfy the tighter tolerance you've already complied with the looser.

What would you do if the looser tolerance was met, but the tighter wasn't ? Scrap the part? Then way would you need the looser if you need the tighter?

Boy that answer went around in circles...

I just went back and saw I didn't completely answer your question, the second part is the "H" on the tolerance.

OK, here you go, the "H" is the pitch diameter limits that were built into the TAP, the call out for the thread should be in

inches is call "B" as in "1B", "2B", "3B" and so on.

For metric, the call out is the letter "D" as in "D3" or "D5".

So the print should say for inch 1/4-20 UNF 3B

for Metric is should say M6 X 1 HS D3

Hope that helps, but is sounds like someone may have gotten confused and put the tap tolerance on a print...

thank u for ur reply on thread tolerance.

i had come across the same in one of the standards.

i will get back to u with the standard coz i don't have it with me right now.

regards

rems

where did I leave that fortune cookie calculator...