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Tool Talk Discussion Forum

Re: NPT tap question

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Jim in Ma.

12-24-2013 15:32:22

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You need a 1/4 NPT tap, it has a taper to it.

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12-24-2013 19:14:30

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 Re: NPT tap question in reply to Jim in Ma., 12-24-2013 15:32:22  
Also note, since you are working with a TAPER pipe tap, you NEVER run it in all the way as you would a regular bolt thread tap!

As a general rule, always stop with a MINIMUM of 6 threads showing above the surface of the hole you are taping.

You can then try screwing in the fitting, see how deep it goes before getting tight. You can then tap deeper if necessary. But if you go too deep...

Be careful!

PS: Check your thread pitch carefully. There are at least 2 different thread pitches (NPT and BPT) that are very similar. NPT is the most common, found on American made products, BPT found on most imported products.

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J. Schwiebert

12-24-2013 20:02:05

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 Re: NPT tap question in reply to Steve@Advance, 12-24-2013 19:14:30  
BPT= British Pipe Thread. It is also found on some hydraulic stuff.

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12-25-2013 08:19:25

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 Re: NPT tap question in reply to J. Schwiebert, 12-24-2013 20:02:05  
would that be the same as BSP- british standard pipe? that's what I know them as for hyd. fittings.

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