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Confused by taper thread vs model engineer thread


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  #1  
Old 01-29-2016, 11:22:49 AM
AppalachianSunrise AppalachianSunrise is offline
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Default Confused by taper thread vs model engineer thread

Hello everyone,

I had a custom coal fired boiler built in the UK and the builder told me I need a model engineer thread? The size of copper pipe I'm using to connect everything together is 5/32 inch. My question is, what kind of american stranded tap and die would work? "1/4 x 40 UST" or "1/4 x 40 MTP" I'll be connecting everything up to run two PM Research steam engines, I would greatly appreciate anyone's help in getting my steam plant connected up.

Regards,
Heath
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Old 01-29-2016, 12:00:15 PM
Big Bird Big Bird is offline
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Default Re: Confused by taper thread vs model engineer thread

check out p_m research. on their site they have an article about n.p.t compared to me. threads. Some will interchange , some won't. Model engineer is a british straight thread.
Other threads are
Mpt. model taper pipe
Me. Model engineers also known as British straight Thread
UST. Universal straight taper. its Made by pm research.
Npt. National pipe taper
Metp. model engineer tapered pipe. which is the British equivalent of MTP.
Hope this helps... I probably just added to the confusion...
But I think you would want to use "ust" Universal straight taper. I think it will interchange with "me" British straight thread.

Last edited by Big Bird; 01-29-2016 at 12:13:24 PM.
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Old 01-29-2016, 02:22:11 PM
AppalachianSunrise AppalachianSunrise is offline
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Default Re: Confused by taper thread vs model engineer thread

Yeah sorry you did. All I wanted to know would the model engineer thread would it interchange with "1/4 x 40 UST" or "1/4 x 40 MTP
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Old 01-29-2016, 02:36:50 PM
Big Bird Big Bird is offline
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Default Re: Confused by taper thread vs model engineer thread

1/4- 40 ust will work for 1/4- 40 me and will screw up nice and tight.. If just using straight thread. You will want to use some Teflon tape or a sealer of some sort on the threads..
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Old 01-29-2016, 11:05:48 PM
Ray Freeman Ray Freeman is offline
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Default Re: Confused by taper thread vs model engineer thread

I think the ME threads are 55 deg against 60 for UN. You can buy ME taps cheap enough. Less than 10 bucks on UK ebay. I've just bought a 3/16 and 1/4 for 6.95 each.
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