In regards to iron and galvanized.... If you thread two long pieces of pipe into each side of a coupling, should the two pipes line up completely plumb and level with each other? Or would the two pipes be slightly escew?

Im thinking the differences in the threads or how far they are screwed into the fitting would have an effect on if they are straight.

I hope my question makes sense.



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Unless the threads were purposely cut on an angle, the pipes will be aligned regardless of how tight they are.

What do you mean by 'purposely cut on an angle'?

So if you don't thread a pipe exactly it will cause the fitting and pipe not to align?

If that were to occur, would the misaligned threads likely leak?



Edited 2 times.

when cutting a thread onto a pipe, it is possible to purposely clamp the pipe crooked in the locking vice. this way one can cut a "crooked thread".
this would allow a fitter to screw a pipe into a fitting so it would come out at a very slight angle. (on purpose)

Unless you get very aggressive with a "crooked thread" it is still a standard thread and seals just like any other. IF you "cross thread" a pipe, then it will NOT seal properly and will leak.

Is it easy to cut them at an angle on accident?

With most dies NO. It takes a special design to be able to do it.

typical plumbing stocks and dies have a 'guide ring' built in to ENSURE a straight thread

if one wanted a 'crooked thread' one would most probably use an "Armstrong" type stock which has no guide (machinist's stock)

plumbing


machinist



the above pics are representative but not conclusive

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638