Simple question from a Simpleton

Simple question from a Simpleton

Joined: June 2nd, 2009, 12:39 pm

March 17th, 2012, 7:51 pm #1

Here's a question for any machinists or plumbers out there. I have an 1/2" pipe clamp from HFT. I need to thread the pipe to fit the clamp. I thought an 1/2" -13 die would do it. Wrong! The question, what size die do I need to thread the 1/2" pipe to fit the clamp thread of the 1/2" clamp?
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Joined: July 25th, 2011, 2:18 pm

March 17th, 2012, 9:42 pm #2

1/2" pipe die. You see the pipe threads are tapered, the 1/2" comes from the internal diameter of the pipe.
Since the threads are tapered you will need to check the fit of the clamp to the threaded portion of the pipe.
Or hit Home Depot or such & buy a piece of threaded pipe, probably cheaper than the die.
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Joined: January 14th, 2011, 9:42 pm

March 18th, 2012, 12:32 am #3

Here's a question for any machinists or plumbers out there. I have an 1/2" pipe clamp from HFT. I need to thread the pipe to fit the clamp. I thought an 1/2" -13 die would do it. Wrong! The question, what size die do I need to thread the 1/2" pipe to fit the clamp thread of the 1/2" clamp?
... short for national pipe thread. So 1/2" NPT oughta do ya.
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Joined: June 2nd, 2009, 12:39 pm

March 18th, 2012, 5:24 pm #4

( which is too small ) is different from an 1/2" NPT?
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Joined: November 6th, 2010, 8:13 pm

March 18th, 2012, 5:44 pm #5

Yes, you have a bolt thread die, you need a 1/2 NPT--national pipe thread.Than there is tappered and straight thread, tappered is used for air, water pipes etc. Straight thread is usually used on ridgid conduit fittings because they don't need to seal.Hope this helps.Joe

Shootem all like you mean it.
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Joined: June 2nd, 2009, 12:39 pm

March 18th, 2012, 6:07 pm #6

Sure does. Thanks Joe. nt
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Joined: July 24th, 2010, 1:44 am

March 19th, 2012, 4:12 am #7

( which is too small ) is different from an 1/2" NPT?
there is also a 1/2"-20 which is the national fine thread. On the other hand, the 1/2" pipe size is .840 nominal in diameter and the 1/2" NPT is a tapered National Pipe Thread designation. There is also a STRAIGHT 1/2" pipe thread that's .840 in diameter with 14 threads per inch.

The NPT tapered threads are for sealing liquids and the tapered joint gets tighter with tightening. Usually there is also some type of thread sealer used to make the joint leak proof.
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Joined: October 25th, 2002, 3:46 pm

March 21st, 2012, 2:14 pm #8

Yes, you have a bolt thread die, you need a 1/2 NPT--national pipe thread.Than there is tappered and straight thread, tappered is used for air, water pipes etc. Straight thread is usually used on ridgid conduit fittings because they don't need to seal.Hope this helps.Joe

Shootem all like you mean it.
they are tapered threads that need to be made up tight for sealing and grounding continuity.

As an Electrician both features are important with threading.

Walter....
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