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Originally Posted by dacooltech
Nexxo, FYI pipe size is the accepted industry designation, not the actual measured size. The inside diameter of 1/4"NPT thread is 3/8...
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Quote:
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Originally Posted by Groth
National Pipe Thread, a very old standard created in the day of cast iron pipe. 1/4" NPT threads would be found on the outside of a thick walled pipe that had a one quarter inch inside diameter.
With better metalurgy/maunfacturing these days, we can make pipes with thinner walls. Thus a larger inside diameter with the same traditional 1/4" NPT threads.
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Thanks for the info. It is all so confusing! As I'm in the UK, I worked with BSP thread, and here 1/4" BSP still has 1/4" ID, while 3/8" BSP has 3/8" ID. I sort of logically assumed that the same would apply to NPT.
Should have known better... since when does logic apply in PC modding!
