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Old March 30th, 2016, 19:13   #16
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Join Date: Aug 2004
Location: Menomonee Falls, Wisconsin, USA
Fuel Economy: 75.0/53.0/38.4

In my experience, Machining cost is about a wash:

NPT = Pre-drill to minor thread diameter then tap - Tapping has to be done carefully as it's a tapered tap. Can't go too deep or too shallow or the mating fitting won't work
SAE = Pre-drill (less than thread minor diameter) then form tool then tap. All are high speed operations

You can get SAE form tools that will drill the rough hole, pre-drill all in one, but they're generally expensive compared to the additional machine time. He's not likely constrained by the machining time anyway.

The NPT tapping/inspection process is also much more controlled/involved than a straight thread port so that end of it typically cancels out any machining time advantage.

All of this may be irrelevant depending on how evguy1 has his process setup.

Fittings/adapters are a negligible cost difference - Can't seem to find the quotes now but they're within a few pennies on a fitting that is less than $2.00 regardless if you're going NPT to JIC, NPT to ORS, SAE to ORS, SAE to JIC, etc
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Old July 24th, 2019, 22:14   #17
Join Date: Jan 2019
Location: montreal quebec
TDI(s): 2006 mk5 tdi

PM sent to you ev guy
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Old July 25th, 2019, 06:34   #18
Join Date: Feb 2014
Location: Erington, BC, Canada

This is an old thread. I did change to ORB threads in these plates back in early 2017 along with a few other minor changes.

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Old July 27th, 2019, 06:33   #19
Join Date: Jul 2019
Location: South Carolina

Pm sent to you ev guy, I know this thread is old.

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