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1/8 or 1/4?

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Old 08-23-2005, 07:12 AM
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1/8 or 1/4?

I hear everyone saying the isspros have 1/8th inch pyro and boost taps, and my invoice syas I got an 1/8inch thermocouple and boost, but they look bigger than 1/8" where do they get the 1/8" from inside diameter, my supposedly 1/8" thermocouple is more like 1/4" outside diameter? EXPLAIN!
Old 08-23-2005, 07:21 AM
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Probably 1/8 NPT thread
Old 08-23-2005, 09:06 AM
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Shovel is right, all pipe thread is measure by the inside diameter of the pipe.
Old 08-23-2005, 10:06 AM
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Originally posted by Geico266
Shovel is right, all pipe thread is measure by the inside diameter of the pipe.
Untill you reach 14"...then it is the outside diameter
Old 08-23-2005, 11:46 AM
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Originally posted by ramtd02
Untill you reach 14"...then it is the outside diameter
i've never really worked on anything that is bigger than 4"npt so i didn't know that...
Old 08-23-2005, 12:03 PM
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1/8'' Pipe tap drill size is a letter "R" drill or .339 dia.
You probably don't have a "R" drill but a .344 11/32 is close enough
Old 08-23-2005, 01:38 PM
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Wink

Originally posted by ramtd02
Untill you reach 14"...then it is the outside diameter
Hmmmm 14" are you thinking of upgrading that 5" dual exhaust........
Old 08-23-2005, 02:44 PM
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So the 11/32 bit will work then?
Old 08-23-2005, 05:19 PM
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Originally posted by Graphite600
So the 11/32 bit will work then?
for the 1/8" npt tap, it will work just fine... that is what i used... i have used 5/16" before too with suscess
Old 08-23-2005, 05:54 PM
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side by side, 1/4 NPT and 1/8 NPT look close, but there is a difference. If in doubt, buy an 1/8 X 1/4 Reducer bushing and tap it 1/4".




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