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A.P.I. American Open Hole Threads (A.O.H.)

A.P.I. American Open Hole Threads (A.O.H.)

A.P.I. American Open Hole Threads (A.O.H.)

(OP)
Hi,
I'm trying to find a detail (diameters, taper, thread form, etc) of API American Open Hole threads. I've googled way too long with no results.
Can anyone help?
Thanks,
John

RE: A.P.I. American Open Hole Threads (A.O.H.)

What in the name of Sam Hill is an API Open Hole Threads?  I've heard and use American Standard(Taper) Pipe Threads though.

RE: A.P.I. American Open Hole Threads (A.O.H.)

Well, I guess all the American Closed Hole threads were too tight to loosen.   8<)

Is NPT the term you are looking for?   There are many references for the pipe size, pipe thread OD, tap hole size, and drilled (through hole, pipe ID) size.

RE: A.P.I. American Open Hole Threads (A.O.H.)

(OP)
Thank you so much hydtools!! That's exactly what I was looking for.

RE: A.P.I. American Open Hole Threads (A.O.H.)

Comparing with pipe threads,  the AOH threads are a lot coarser than pipe threads--I guess because of the sand and dirt from drilling operations. Great reference Hydtools

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