fitting 3/8 NPT sensor in 3/8 BSP fitting? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 04-19-2010, 04:25 PM   #1
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Default fitting 3/8 NPT sensor in 3/8 BSP fitting?

Can you fit a 3/8 NPT (GM IAT) sensor in a 3/8 BSP fitting? I now the threads are bit different.
Reason is that I want install a GM IAT in the silicone hose from IC piping to throttle body. I'd use one of these, but they only exist in 3/8 BSP.
Could I safely run a 3/8 NPT tap through it?
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Old 04-19-2010, 05:42 PM   #2
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I will go ahead and give you my experience... I was looking to find a 1/8" BSPT hose barb fitting, but tried to put a 1/8" NPT in instead. It will thread in, but upon removing the NPT barb, only 2 threads were engaged. I wouldn't trust it. Everyone told me to re-tap it for NPT. That or get an adaptor... Good luck in your quest (it was a PITA).

Here's the difference in the two (BSPT on left; NPT on right):


Edit: Hate to tease you, but this is what you need only in 3/8" instead of 1/8". http://www.pegasusautoracing.com/pro...asp?RecID=3142

Question: Is it a regular BSPP (parallel threads) or BSPT (tapered threads)? If it is BSPT I have your fitting, if not, the hunt continues. http://www.premiair-pneumatics.co.uk...ctCode=S010131 It's in Europe too, so would save you on shipping from the States.

Last edited by thagr81 us; 04-19-2010 at 06:05 PM.
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Old 04-19-2010, 06:13 PM   #3
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Now that you mention it, it might be non-tapered BSP. I assumed it would be tapered so I could run a tap through it. I'll ask them.
That adapter would be ideal, but the tip of the GM sensor won't be long enough to reach through.
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Old 04-19-2010, 06:14 PM   #4
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Got the BSPP one... http://www.coleparmer.com/catalog/pr...sp?sku=3183052 Pricey, but will work for ya. Check with them prior to ordering. I will take payment in beer from Belgium please.

Just read the last part about the sensor not being long enough... Sucks. :(

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Old 04-20-2010, 01:30 PM   #5
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ouch, pricey indeed, that $40 in your money
I think I'll just order the fitting, run a tap through it and apply abundant thread sealant
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Old 04-20-2010, 01:33 PM   #6
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Sounds like a plan... Good luck. Actually it's $23.75 USD here.
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Old 04-20-2010, 01:37 PM   #7
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hmm, got a reply that it's parallel thread. IOW, no tapping :(
Off to the welder
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Old 04-20-2010, 06:53 PM   #8
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Mega-weak... Good luck.
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