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Old 04-27-2012, 11:24 AM   #1 (permalink)
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Difference between NPT and NFT Threads

So I was digging around our schools machine shop while looking for an 1/8"-27 NPT tap and instead I came across an 1/8"-27 NFT tap. I checked online and couldn't find any discernible difference between the two taps (NFT and NPT), it sounds like NFT is just a designation given by Briggs & Stratton for an NPT thread. Anyone have any insight on this? Will an NFT tap work in place of an NPT tap?
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Old 04-27-2012, 11:29 AM   #2 (permalink)
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This is what I found:

SAE Thread Classifications | eHow.com

Quote:
NPT

National Pipe Threads are designed to compress when threaded together. This compression forms a tight seal and is adequate for pressurized liquids and gases. NPT threading ranges from 27 TPI for small pipe (down to one-sixteenth inch) to a coarse big eight threads per inch for two-foot pipe.

NPT is a standard for both pipe and the corresponding fittings for ensuring compatibility through the length of the line. Used for all metal pipe, NPT standards are also applied to some plastic pipes.

NFT

National Fine Threads are for more exacting assemblies and are the standard for nuts, bolts and most mechanical systems. NFT threads range from 64 TPI (very fine) to a large eight TPI. National Fine Threads also have the same 60-degree pitch angle (the "tilt" of the threads from a straight plumb line) with matching male and female pitch.

National Fine Threads do not compress to the degree of pipe threads as assemblies are intended for more rapid assembly and removal or disassembly.


Read more: SAE Thread Classifications | eHow.com SAE Thread Classifications | eHow.com
Does the tap look tapered?

Try it in a piece of scrap and see how a fitting or set screw goes in.
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Old 04-27-2012, 11:33 AM   #3 (permalink)
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Quote:
Originally Posted by desertT1 View Post
This is what I found:

SAE Thread Classifications | eHow.com



Does the tap look tapered?

Try it in a piece of scrap and see how a fitting or set screw goes in.
I came across that as well, the tap is tapered. I may have to drill and tap a piece of scrap aluminum to see how it works. Just so you know, the fitting I'm trying to thread into the aluminum is a CCI 90 degree hardline fitting.
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