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E.DO TOOLS CO.,LIMITED
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E.DO TOOLS CO.,LIMITED [China (Mainland)]
Business Type:Manufacturer
City: Ningbo
Province/State: Zhejiang
Country/Region: China (Mainland)
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Mr.Jack Tan:
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NPT Size
Fitting sizes can be a bit confusing! Please don't make the assumption – as I used to - that a 1/4 NPT fitting has a thread diameter that's actually 1/4 inch in diameter! Visit your favorite hardware or plumbing store and ask for a 1/4" fitting. The north-American standard fitting they will likely show you will be a 1/4" NPT. You might be surprised to see that the actual diameter of the 1/4" NPT thread will be just over 1/2”.
To help you "get a grip” on the actual sizes of NPT fittings, see the chart below. It shows the comparison between NPT fitting sizes and their actual inch equivalents.
On this chart I have listed the NPT thread size first, and then what that NPT thread size is in actual (decimal) inches, and then the closest common size fraction.
If you've not used NPT fittings before, the size 'discrepancy' will surprise you.
