brake line fittings (2013)

Adapter to mate brake caliper stand pipe to modern brake hose fitting
https://www.speedwaymotors.com/Earl...MI-LPKwcTT2QIVgiZpCh3_FQiAEAQYBSABEgJiufD_BwE

Cycle brakes don't generate the hi PSI that power brakes with double flares do. Its about impossible to double flare by hand a 1/8" rigid steel tube w/o fracturing as must also bevel tube end to bend inward on second flare step, so assume must be swagged with special tooling before after fittings slid on.

Deets55 said:

Confusing as heck. Looking at the pdf. I guess there are a couple of variations on this. If I’m reading this right 37 degrees is a single flare similar to a AN fitting and 45 degrees would use a standard double flare.

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http://www.fedhillusa.com/webnuts/common flares6.pdf
DIN/ISO single 'bubble' flare is shown on the pdf, but SAE single flare is not.

Deets55 said:

The female nuts on the Fedhill site would use the 45 double flare.

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Well, the drawing on the pdf shows the SAE 45 degree double flare.

Deets55 said:

Does that mean since Norton is using 37 degree bulkheads that a single flare is the correct choice?

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Where did you get Norton 37 degree bulkheads from?
Norton bulkhead fittings are 45 degree (below).

Where did you get Norton 37 degree bulkheads from?
Norton bulkhead fittings are 45 degree (below).

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And there lies the root of my quandary.

(Mis-) reading Ricks question about mating a 45 degree dbl flare to a 37 degree bulkhead had me thinking that Norton was using 37 degree bulkhead on their brake fittings.
Thanks for clarifying that Les.

L.A.B. said:

I don't think so, and 'bubble' doesn't seem to be the only option for 'British' lines.
http://www.austinhealeywood.com/brakelines.html

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This is a good look at the end of the "bundy" 06-2708 or 06-3899, which all the sites like Andover obscure in their photos. I believe it shows an "inverted" or "double" flare with a 45° seat.
Attached is a pic of the fitting on the hose I'd like to use ('cause it's already paid for) which has the AN (Army/Navy) 37° bulkhead.
Thanks for the Fedhill link, which I reviewed earlier (along with many others) and found no answer to the question:

Is it acceptable and safe to use an AN 37 male (bulkhead fitting) cinched up to a 45 degree double flare?

Something like this
https://www.ebay.com/itm/AllStar-St...311205181450?_trksid=p2385738.m4383.l4275.c10

Might be nicer stuff out there.

I've sold 100's of the AN3 bulkhead fitting which were used to connect to the steel caliper pipe for my various brake systems.
Not once have I had an issue with this setup. I have been using this on my own bikes for years as well

nortncom said:

Would an AN3 fitting in 3/8-24 work at the hard line going to the caliper?

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Automotive & most motorcycle hard brake lines are steel. 45 degree flares are the rule. AN [Army/Navy precursor to MS] is aircraft hardware. On aircraft, it's all about saving weight. Therefore, typically, brake & hydraulic lines are made from 5052-(T)0 tubing. If you try to put a 45 degree flare on aluminum tubing, it will split. Therefore, AN [aircraft] tubing and fittings is only 37 degree flare. I actually own a rather pricey 37 degree "double flaring" tool.
To answer your question, it would probably seal. That said, the other members have offered you several, much safer alternatives.

"it would probably seal." No, not probably seal, it does seal and I have proven it 100's of times.
I also own a rather pricey 37 degree "double flaring" tool.

The bad news: there does not seem to be such a thing as a straight bulkhead fitting adapter with 37° AN3 male one end and SAE 45° male at the other. Best we cd come up with at the hose supply place was a 2 pc affair, going AN3 to 1/8 npt female, then male brass 1/8 npt to SAE 45 end to match the double 45° flare. Even then it was not a bulkhead fitting, so no good way to attach to the bracket.

The good news: Don is correct; these guys ignore this mismatch all the time for AN3 and have made hundreds, if not thousands, of tested lines this way. AN6 and AN10, he says, will not work in this way, but AN3 is good to go.

I would be hesitant in using 45 degree male in a 37 degree female flared pipe as you are putting the sealing pressure
on the outer end of the pipe flare where it is already thin and the metal is already stretched.

I would too.
But (with our stock bundy) we have it the other way around, putting a 37° male into a 45 flare, which, as you say, makes for a good seal.

Don't ya just love the dilemma when two or more valid views/paths contradict and the best way doesn't exist off the shelf. May loose respect going the mis-match expedient proven vendor way or maybe save madass feeling by having him make some custom adaptors as they will be needed again by others like me to get - respectable again. At least 2 piece adapter ugly scab up desperate solution gives a fairly long hard point to fab up your own mount and serves ya right for jumping Norton factory numbered parts w/o going completely over the fence replacing whole front end. I'm a custom chopper kind of guy hoping to offend prime/proper's and psyche out cometition so Mz Peel gets where ever works tiddy light practical but may inspire ya to carry on on ya own. The stand pipe gets clear short tube surround then safety wired to the blade. the alu air muscle mount is failed idea now removed so blade sits clean on fork brace face.
Broken link removed

I got some of that Steve, If anyone was really paranoid about the an3 37 degree angle on the bulkhead fitting then it wouldnt
take much to remachine the fitting from 37 to 45. I have no intention of doing that.