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Thread: fittings

  1. #1
    Join Date
    Jan 2009
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    fittings

    Can someone tell me what thread size of the flared nut is on tank and pump fittings. 3/8" is to big and 5/16" is to small. Thanks

  2. #2

    Re: fittings

    Oil tank fittings are 9/16 -24

  3. #3
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    Re: fittings

    Thanks, what class do they fall into? They don't correspond with JIC or AN, assuming that they have a 37* flare.

  4. #4

    Re: fittings

    Harley oil line flares have always been a "special" two-stage, or "bumped" flare. You can't make one that won't leak with a regular flaring tool. I found that to be the reason my ULs return pump leaked for years: a common flare I'd put on the return oil line just wouldn't seal.
    That's why some entrepreneur sells three flared little 90º tubes for over $50 on Ebay. I don't know the technical title for the special flare.
    Sarge, Gerry Lyons, Fla.
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  5. #5
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    Re: fittings

    Thanks Sarge, I didn't know what it was that made them special. Have you ever tried to form a tool?

  6. #6

    Re: fittings

    I custom made that very adaptor for my flaring tool. When I swapped to a 2-1 exhaust from the standard FLH 2-2, I needed to re-route the oil return line around the rear header.
    Pics of the tool with adaptor, oil pipe, bending equipment etc are on my blog along with detailed description. I note I called it a 30° flare but in any case I modelled the adaptor to my oil pump fitting. It's worked since 2016.
    Cick appropriate blog link below and head over to the "Exhaust system, oil lines and filter" page.
    Hope this helps. Happy to elaborate. Good luck.

  7. Re: fittings

    Are you referring to inverted flare, as used on automotive brake lines?

  8. #8
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    Mar 2008
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    Beautiful Northern NM
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    Re: fittings

    It is merely a double (or inverted) flare and is not unique, but the angle and length make it hard to find correct flaring tools to do. Double flares have a double layer of material at the open end that makes them stronger and also narrows the sealing area, so more pressure over a narrow area creates a much better seal.
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  9. Re: fittings

    That's a very good explanation.
    I always fabricate oil lines because the aftermarket offerings need to be reformed anyway, so why not just start from zero. I use a high quality 37 degree flare tool and make simple flares, as inverted flares are a real pain in the ass to make with hand tools. I have no leaks, even with stainless tube.


  10. #10
    Join Date
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    Re: fittings

    Thanks Guys, but I still need the nuts.Where can I get them?

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