Barrel (Inverted Flare)nuts for hard brake lines - Chevelle Tech
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post #1 of 18 (permalink) Old Mar 28th, 20, 10:47 PM Thread Starter
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Barrel (Inverted Flare)nuts for hard brake lines

Hey everyone hope you're all doing well in these times right now. I went to install new hard brake lines on a new rearend for my 66 Chevelle this morning. I bought new 3/16" brake lines and when I went to thread the the new line to the caliper the barrel fitting on the new brake line is a bigger size than the original 1/8"-27npt that the car has. Does anyone know where you can buy just the barrel/ tube nuts anywhere? I looked on Summit and Jegs with no luck. I'm putting a Strange S60 rearend with Wilwood disc brakes. Any help would be greatly appreciated thanks and be safe 👍🇺🇸👍

Last edited by LevonH; Mar 29th, 20 at 11:22 PM. Reason: Added Inverted Flare to title.
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post #2 of 18 (permalink) Old Mar 28th, 20, 11:41 PM
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Your local Napa auto parts store should have them. I just did some work on my lines in the rear and that's where I purchased my tube nuts.
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post #3 of 18 (permalink) Old Mar 28th, 20, 11:47 PM
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Re: Barrel nuts for hard brake lines

I found them on Amazon.

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post #4 of 18 (permalink) Old Mar 28th, 20, 11:48 PM
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Re: Barrel nuts for hard brake lines

1/8"-27npt is a tapered pipe fitting thread. Normal brake lines are straight thread. They may resemble an 1/8 x 27 pipe thread, but they are different.
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post #5 of 18 (permalink) Old Mar 29th, 20, 3:42 PM Thread Starter
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I'll check Napa, I know the line size is 3/16 but the new hard lines but for some reason the barrel nuts on the new lines are bigger than what the stock lines are. I hope I can find the right barrel nuts instead of using adapters
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post #6 of 18 (permalink) Old Mar 29th, 20, 4:02 PM
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Re: Barrel nuts for hard brake lines

Make sure that you try the nuts before putting them on the line and flaring it. One of my customers who does mostly restorations bought a bunch locally and it turned out they were offshore junk and the threads were just slightly off Not sure where he got the good ones from but I can find out if you cant get them in your area.
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post #7 of 18 (permalink) Old Mar 29th, 20, 4:16 PM
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Re: Barrel nuts for hard brake lines

You could also get them from AMK.
OK this is their web site -
https://www.amkproducts.com/

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post #8 of 18 (permalink) Old Mar 29th, 20, 5:15 PM
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Re: Barrel nuts for hard brake lines

3-16-Inch-Steel-Brake-Line


Standard size nuts are 3/8 x 24 on a 3/16 brake line, same as a 3/8 fine thread nut or bolt.
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post #9 of 18 (permalink) Old Mar 29th, 20, 6:37 PM
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Re: Barrel nuts for hard brake lines

You may have bought a metric size.
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post #10 of 18 (permalink) Old Mar 29th, 20, 9:00 PM
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Re: Barrel nuts for hard brake lines

Quote:
Originally Posted by gnicholson View Post
You may have bought a metric size.
They have a different flare too, right?

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post #11 of 18 (permalink) Old Mar 29th, 20, 10:50 PM
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Re: Barrel nuts for hard brake lines

Calling inverted flare nuts "barrel nuts" ?

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post #12 of 18 (permalink) Old Mar 29th, 20, 11:22 PM
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Re: Barrel (Inverted Flare)nuts for hard brake lines

Edited title.

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post #13 of 18 (permalink) Old Mar 29th, 20, 11:45 PM Thread Starter
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They were 3/16 brake lines I bought a couple different ones so I would have on hand incase I bent one wrong. When removing the old brake lines I would use a 3/8" wrench and the new lines I bought would have to have a 7/16" wrench to tighten the fitting up. My apologies Dean for calling them barrel fittings I obviously didn't know the correct name for the fittings I'm just trying to get some help so I can move forward with my build since this was a bummer for me cause I really thought I would have the old 10 bolt out new lines plumbed and the new rearend installed. Nothing like having a plan thinking you have the correct parts and then realizing something isn't right
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post #14 of 18 (permalink) Old Mar 30th, 20, 8:37 AM
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Re: Barrel (Inverted Flare)nuts for hard brake lines

Lots of different fitting nowadays.metric,european ,combination.Just chop it off and reflare it with your old fitting,if you havent got a flaring tool bring your caliper with you if the parts store is that stun.

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post #15 of 18 (permalink) Old Mar 30th, 20, 8:53 PM Thread Starter
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Ok I believe I got it handled. I'm assuming that the lines I bought from O'Reilly's had a bubble flare on the end so nut is probably a metric size. So that's where I'm sure I got tripped up on. I ordered new fittings to use on the new lines since the old ones got chewed up pretty good trying to bust them loose. Thanks again everyone for the help
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