I have been using 37° JIC for many years on many things, including mostly just about all fuel line connections.

I use a lot of JIC Female Swivel x Hose fittings.

--- Honestly, though, other than the fittings usually being quite a bit cheaper, I have not yet figured out where JIC is superior to plain old SAE 45° ---

I was at a swap meet and spotted, covered in dust, a big bag of what I thought were 06 Push Lock x 06 Female JIC Swivels --- the size I use --- for a ridiculously low price; the guy selling them had no idea what they were nor where they would be used; I talked him down to an even lower price and put them in my wagon; safe and secure in the knowledge that I wouldn't be needing to buy any JIC Female Swivels for a long time.

I put them in my big JIC Fittings tool box.

Now, in the middle of a big fuel line renovation project, I grabbed one of them and crawled under the truck.

Luckily, I attempted to screw it on the JIC Male Adapter before I pushed on the hose --- it just fell over the Male Adapter --- didn't even touch the threads.

My first thoughts were this particular one must be an 08.

Back at the bench with my big swap meet bag of swivels and I compare the one in my hand with all the others = all exactly alike.

Like all swivel fittings I have ever seen, there is not an identifying mark on them anywhere --- I just assumed I had misjudged and the swivel end were 08 instead of 06.

Then, way down in the bag, there was a single swivel screwed onto a matching Male -- the Male was stamped with identifying marks.

I get my big strong seein' eye glass and check it out === 06 PushLoc x 06 SAE; so....., my big bargain bag of what I thought were JIC happen to be SAE --- I counted them and ordered the same number of SAE Male Adapters; so, I still have a huge bargain, just not what I really wanted.

Now, if you are still with me, remember when I said the 06 SAE Female just fell over the 06 JIC Male ?

This brings a big question that has kept me up several nights and put me off my feed.

I often see quite expensive Female Swivels that are "Dual Seat" JIC and SAE; reading the description leads me to believe that no matter what the Male is, JIC or SAE, these Dual Seat Female fittings will fit and work ----- how can that be humanly possible when there is such a huge difference in the diameter of the Male fittings ?

My mind says that, dual seat or no, the Female threaded collar is either going to have to fit a Male SAE or a Male JIC; it sure can't screw on both --- or can it ?

 

Have you been to "The Parker Store" ? You can google to find one near you. At work, Aero-Space Industry, I would use Parker fittings for decades. We mainly used AN, or Compression fittings (A-lock), along with NPT at times. I do recall briefly looking at JIC, but they were not something we used. I seem to recall they were a different thread angle then AN. Before I retired, the maintenance guys were using push-lock.

The guys at Parker will have the answer.

https://www.google.com/search?q=the+...hrome&ie=UTF-8


You also could have bought metric fittings. I recall there are also BMTS threads too as well as others.

You got my memory going, near the end of years, the bean counters, to save money, began to buy Dk-Lok fittings. Before I used them, I had to do my own testing and showed how their Dk-Lok fittings were not the same as Parker. I called the company, they sent a Rep out to see my experiment. When I showed him my data, he thanked me for finding this, went back, and they made changes to their product.

 

My sack of SAE Males arrived and they fit my swap meet swivels like they were meant to.

I need to mark the swivels in some way so as to know what they are if I ever have reason to use them somewhere other than the first place I use them.

The SAE will do their job just as well as the JIC; I just can't swap them around nor get them confused.

An ideal situation to mix them would be on the ends of a line that has a check-valve; put a JIC on one end and a SAE on the other and it would be impossible to get a check-valve backwards as the lines would only mount one way.

The same scenario holds for a line that has one of those simple inline priming pumps.

Other than me just knowing they are different --- they sure fooled me laying there in a sack at the swap meet --- the SAE Males were no more expensive than the JIC Males; so, my swap meet swivels are still a huge bargain and I can use that bargain now.