SpudFiles

Fastenal has stores all over the US. They even got them in the Netherlands and Singapore too.

This is the link for a 1/2" QEV http://www.fastenal.com/web/products/de ... ku=0443030

This is the link for all the QEVs http://www.fastenal.com/web/products.ex ... 3556&Nty=0

Find a store near you here http://www.fastenal.com/web/locations.ex

They only have 1/2" ones in npt.
and they are expensive.

*shrug*

Cheaper than the UK suppliers and they are all in NPT.

No one in their right mind buys the 1" versions of those, I don't know where the massive price hike comes from but it's insane.

i'd still rather go to mcmaster

yea mcmaster probly has cheaper and faster shipping and the qev's are alot cheaper

Wow, there's one ten minutes away from my house, I think if I bought one from the store, it might be cheaper than Mcmaster since I wouldn't have to pay shipping.

Spudthug, these stores use in store pick up they don't ship to your house but rather the store and you don't have to pay the shipping that way. They might even have what you want in stock at your local store so you don't have to wait for your item to be shipped to the store which I think is a better deal than Mcmaster. They sell the Airlines style QEV which is the main reason I want to buy from them.

EDIT: Frankrede, this is a quote from an article I found concerning NPT vs. NPTF threads (which is the kind of threads most of these QEVs have). "Since NPT threaded parts require sealing compounds, it is acceptable to use an NPTF tap for NPT applications. However, NPT taps cannot be used for NPTF applications, as it will likely produce a thread that will leak." This means you can use male NPT threads with female NPTF threads and sealant, but you can't use male NPTF threads with female NPT threads because it will most likely leak.

I did not know that.
Cool, I want to know if the male nptf threads will leak in female npt threads if their is sealant added too.

Hi frankrede

I think it is worse than the other way round. It you screw a tapered thing into a cylindrical, they will contact at the surface. If the connection is twisted and bent a little, the arm of momentum it quite short.
With a cylindrical into tapered, they will contact at the tip, and the arm of momentum will be long .. and the diameter where the two hold together is smaller.
Anyway, the recommendation is: Do not mix cylindrical and tapered .. and if mixing, it should be tapered male, cylindrical female. In here, I have never seen a tapered female thread (or I didn't look hard enough .. for females).

Regards
Soren

We are not talking about cylindrical with tapered here only NPT and NPTF. The two types of threads, NPT and NPTF, are completely identicle except for this one slight difference "With NPT threads, after a wrench is applied, slight spaces at the major and minor diameters may exist that would allow the assembly to leak and therefore a sealing compound is used to fill any gaps. On the other hand, NPTF threads are designed to ensure that sufficient crushing of the entire thread form will take place to produce a mechanical seal."