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cecollins 10-28-2011 09:11 PM

Manual pipe threading problem
I need to cut new threads on a piece of 1/2" black iron pipe.
I have a die kit [Craftsman] that has a 1/2" die.
I matched it up with a new 1/2" B.I. nipple \.
The die is too small for the O.D. of the nipple.
What size die do I need??

I just did some measuring and found that 1/2" black iron is 1/2" I.D. [I should have known that].
The O.D. is 5/8". Is that the die I will need?

Gary in WA 10-28-2011 09:24 PM

Welcome to the forum!

I'll move you to "Plumbing" for a better response....


Ishmael 10-28-2011 10:05 PM

Your Craftsman set is designed to cut or repair threads on nuts and bolts - a "running thread". You need a 1/2" pipe die which cuts a tapered thread since the goal with black pipe and fittings is for the joint to get tighter as it is screwed together. (A 1/2" pipe die is only nominally 1/2" - it fits the outside diameter of the pipe.)

cecollins 10-28-2011 10:36 PM

Thank you very much for your prompt and knowledgable reply.
What hardware will I need in addition to the 1/2" pipe thread die?

Ishmael 10-28-2011 11:31 PM

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