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-   -   Quick Fittings Size Question (http://forums.procooling.com/vbb/showthread.php?t=11414)

MaxxxRacer 03-14-2005 12:13 PM

Quick Fittings Size Question
 
Hey guys I was wondering if any of you knew the inner diameter of the threads for 1/4 and 3/8npt fittings. I have a flow meter here and i cant tell which it is. the pamphlet that comes with it says its either one of these to but i cant discern which one it is. the ID of the threads on the holes are .44-.45 inches.

bigben2k 03-14-2005 02:26 PM

You can pick up some cheap barbed fittings at your local hardware store, usually. Sounds like you got 3/8 connections.

MVC 03-14-2005 07:47 PM

Hi Max, the ones on the back are 1/4" NPT, the ones on the top/bottom are 3/8" NPT. But, for the actual measurements, this is a good site: http://www.engineeringtoolbox.com/np...ds-16_750.html

CoolROD 03-14-2005 09:30 PM

Quote:

Originally Posted by MaxxxRacer
Hey guys I was wondering if any of you knew the inner diameter of the threads for 1/4 and 3/8npt fittings. I have a flow meter here and i cant tell which it is. the pamphlet that comes with it says its either one of these to but i cant discern which one it is. the ID of the threads on the holes are .44-.45 inches.

If the ID of the threaded holes is ~.44" (tapered):
The OD of 1/4 NPT pipe is 0.54"
The ID of 1/4" NPT SCH 10 pipe is 0.410"
The ID of 1/4" NPT SCH 40 pipe is 0.364"
The ID of 1/4" NPT SCH 80 pipe is 0.302"

-->the threaded hole has to be 1/4" NPT if you know it is some size NPT...

MaxxxRacer 03-14-2005 10:02 PM

mvc, there is no bottom hole on this ones. kinda wierd. the only holes that are usable are on the back. but the good part about all of this is that i will be able to use the turn dial to ajust the flow.

guys ,btw mvc was the nice chap who let me have these. Thanks man.


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