Compression fittings

[Jack]

Anybody know if regular 1/4" compression fittings work OK on 1/4" stainless steel tubing? They fit OK but the stainless is hard, tough and has a mirror-bright slick finish. Would it slip out of the compression ferules?

I have this stuff, don't have regular steel and can't use copper. It is for the fuel pressure gauge on a D2 5U engine, not all that much pressure, maybe 40 psi or so.

If anyone can share some experience it will be much appreciated. Thanks,
Jack

[B4D2]

I've never used SS with compression fittings, but my inclination would be that the typical fitting uses brass ferrules, nuts and fittings that are harder than copper line, so you get a good "crush" from the ferrule into the copper. I would think that the best thing to do is give it a try and sacrifice one ferrule and possibly a nut to see if it will bite. My guess is no.

[ccjersey]

I've got a Ford diesel engine with one injector line that has a slip-on ferrule on one end. I never knew it was there until I loosened the nuts one day to bleed the pumps and the line slipped right out of that one. After I got rid of the air, I put it back and tightened it up and it's been running a year or more since with no problem. I would try it. Over the long run, copper line can crush and vibrate enough that the ferrule no longer seals tightly. I doubt you will have that problem with that SS tubing!

[OldNuc]

It works fine.

[CR]

I have always used Swagelock fittings on stainless steel tubing. They are much more expensive that the local hardware brass fittings, but are are rated anywhere between 6,000- and 60,000 PSIG depending on the type of fitting you are using.

[zootownjeepguy]

You could try a couple light cuts with a wheel type tubing cutter where the ferrule will go just to give the ferrule something to bite into.

[Jack]

Thanks for the replies, but the fact is I finally found a piece of 1/4" steel brake line. I know this stuff will work.

I do appreciate all of your contributions. thanks again.

Jack