I think Rodger hit upon what I was looking for but I found this which pretty much explains it.

http://www.chevellestuff.com/tech/an_fittings.htm

Basically, I want to pull a schraeder valve from a fuel rail and run a Fuel Pressure gauge on the rail. The schraeder valve is 1/16" male NPT and the Fuel Pressure Gauge runs a 1/8" female NPT. I was trying to locate a 45* aluminum adapter rather than a straight brass one.

John

Rodger,
I rang the wrong phone.


John,
Good luck trying to find it in a 45. Either Godman high performance or Pure choice motorsports I think has that adapter in a strait. Or you can go to a local auto parts store with an Edelman brass air hose fitting selection. Take a fitting that has a 1/8" compression hose to 1/8 pipe female adpter like in your autometer oil pressure kits. Unscrew the hose side and if I remeber correctly that thread will screw into the shraider hole. From there you can put a 45 on it but it might start to look ugly being that long. Hope this helps.

Thanks but, yeah, just too many adapters on top of adapters. I wanted to find a tee that had a 1/16" male NPT-1/16" female npt-1/8" female NPT. This way I could use the 1/16" Male NPT where the schraeder valve was and move the scrhaeder to the 1/16" female NPT and put the fuel pressure gauge on the 1/8" NPT.

John

The standard it does not specify inside diameters do to varying wall thickness. The sizing system works off OD.
http://en.wikipedia.org/wiki/AN_fitting

exactly. I know you're aware of this but my post was for those who weren't. If they have a 3/8" steel barb and wanted to add some braided line to it to go to the carb for example, by that chart they'd buy #6 and it would be almost impossible to get it on the barb, id too small. #8 would be the correct choice. Just trying to save someone from buying the wrong stuff.

Jody

I got you this can be very confusing to those who don't know how it works. I have been fortunate enough be work closely with Brown and Miller Racing Solutions BMRS. They supply most of the hoses used in nascar as well as the American la Mans series. They have always strengthen me out and explain how things should work when I get confused.

I do it on a regular base. Try making your own fitting. Find the proper fittings that your going to use cut them apart and silver soder them together. This way you can make your tee that you want

Mark