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Flair nut Seat Cutting

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  • Flair nut Seat Cutting

    I didn't see the solution in MSC. I need to cut a 37 degree seat for 5/16 flair tubing. Does someone make a piloted seat cutter for this? Is there an easy way to do this?

    Actually I need to clean some damaged seats up, I don't really need to cut new ones this time. I have NEVER had a flair fitting leak, but some ham handed person (previous owner) has buggered two and I would like to fix the leaks.

  • #2
    Maybe one of these:

    37 degrees is usually aircraft tools. Don't know where else you'd find it.

    Or is it the other side, not the tube?

    [This message has been edited by Sprocket (edited 06-25-2005).]


    • #3
      <font face="Verdana, Arial" size="2">Originally posted by Sprocket:

      Or is it the other side, not the tube?
      i think so...


      • #4
        Hey Flyingchips,

        I think the tool(s) you want are sold by refrigeration supply houses.

        A cup nut screws onto the fitting and a cutting tool with a tee handle lines up in the cup, twist the tool and cut (clean up) the seat.

        I don't know of a particlular brand from memory. Most likely Imperial makes one.

        A comercial refrigeration shop might be able to help you.

        You might be able to rent one from a rental tool place.


        • #5
          If it's 5/16 it's probably not AN stuff. Are you sure it's 37 deg. and not 45? Either way, for both series you can buy copper cone-shaped washers that will fit between the tube flare and the fitting, to seal boogered-up seats.


          • #6
            Where are these copper cone washers found? Sounds like the solution.


            • #7
              I've gotten mine from hardware stores over the years, but here's a link I found with Google:



              • #8
                Earls Performance Products - makers of aluminum 37 degree AN fittings and stainless braided hose - among other things, makes a conical seal for repairing damaged seats.
                The conical seal is a soft metal piece formed to match the fitting.
                It works on either male or female fittings.

                They are size specific so if you're running a #10 fuel line you'll need #10 seals etc.

                Installation is simplicity itself.
                Fit the conical seal over the male fitting and assemble.
                We've used these often and never a problem.

                It's not recommended, but the conical seal allows 45 degree fittings to join 37 degree AN fittings with no problems.
                We've done this one in oil systems that routinely reach 100#.

                Speed shops that carry Earls usually have them and if not you can mail order them.

                Earls also has a website.

                And fwiw - I've taken a light cut on damaged male fittings to clean them up.
                Works fine.

                I've also cut a 45 degree chamfer on the 37 degree AN fitting to set up a fuel injection system.
                One of those Friday night, "what are we gonna do now" bits before the races....


                • #9
                  And if all that doesn't work, look for a JIC #-5 fitting in the hydraulics section of your favorite catalog.