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SAE & DIN brake pipe flares
scudderfish - 19/5/15 at 12:17 PM

I need to make up some new pipes to go to my repositioned M/Cs (Girling if that makes a difference). I want to get a reasonable tool (not the clamp things that go for circa £15), but some say they only do SAE and others only do DIN. What are they, and what am I likely to need?

Regards,
Dave

adithorp - 19/5/15 at 12:35 PM

You probably need DIN flares. SAE flares are used on imperial/UNF unions. DIN on metric unions

SAE are more conical in shape (the union is a bit countersunk) whereas the DIN flare is flatter. Now the official line is you should never mix the two (on pain of death, disease, famine, etc). In reality an SAE flare will compress when fitted to a metric nut and seal perfectly well... I wouldn't try the DIN under a UNF union though.

britishtrident - 19/5/15 at 12:39 PM

You need a DIN ™Powerhand" (sold under many different brand names) tool, SAE flares are still around but they haven't been used on any European model launched since 1970 when the UK car industry started to go metric.
A DIN flare will seal on a UNF or a BSF fitting.

ken555 - 19/5/15 at 01:01 PM

With the "Powerhand" tool, I've noticed that the DIN version of the tool just comes with a single flare "bolt" where the SAE comes with both a double and single "bolt"

Not sure if that means that DIN doesn't do double.




SAE




DIN

britishtrident - 19/5/15 at 02:48 PM

Din version definitely comes with a double ended press tool, something wrong with that one.

James - 19/5/15 at 04:46 PM

The grease is edible with the other type too...

ken555 - 19/5/15 at 05:00 PM

quote:
Originally posted by britishtrident
Din version definitely comes with a double ended press tool, something wrong with that one.




Even the YouTube video seems to suggest this.

rusty nuts - 19/5/15 at 05:51 PM

Some Girling type master cylinders may need 3/8"unf pipe nuts and SAE flares , check by trying a brake pipe nut in the port. If you only want to make up a couple of pipes I have a flaring kit you can borrow if you collect from near Addenbrookes Hospital in Cambridge

scudderfish - 19/5/15 at 07:34 PM

quote:
Originally posted by ken555
quote:
Originally posted by britishtrident
Din version definitely comes with a double ended press tool, something wrong with that one.




Even the YouTube video seems to suggest this.


The vid shows the single flare being done on the DIN tool and the double on the SAE. Hmmmmm........

scudderfish - 19/5/15 at 07:37 PM

quote:
Originally posted by rusty nuts
Some Girling type master cylinders may need 3/8"unf pipe nuts and SAE flares , check by trying a brake pipe nut in the port. If you only want to make up a couple of pipes I have a flaring kit you can borrow if you collect from near Addenbrookes Hospital in Cambridge


Thanks for the offer, but then I'd be denying myself the opportunity to buy a new tool I checked a nut from one of the M/Cs with a thread pitch gauge at 1mm which hopefully means I've got metric ones.

scudderfish - 19/5/15 at 08:01 PM

This claims to be a DIN tool that does single & double.

http://www.ebay.co.uk/itm/Brake-Pipe-Flaring-Tool-Professional-In-situ-4-75mm-DIN-Hand-Held-FL027-/400797935163

scudderfish - 20/5/15 at 07:46 PM

quote:
Originally posted by scudderfish
This claims to be a DIN tool that does single & double.

http://www.ebay.co.uk/itm/Brake-Pipe-Flaring-Tool-Professional-In-situ-4-75mm-DIN-Hand-Held-FL027-/400797935163


I checked with the seller and it was mis-listed.

OK, when would I need to use a double flare?

ken555 - 20/5/15 at 10:52 PM

quote:
Originally posted by scudderfish

OK, when would I need to use a double flare?


Any Female fittings.




So normally flexible hoses to solid pipe or repair sections/joins in the pipe.

[Edited on 20-5-15 by ken555]

scudderfish - 23/5/15 at 08:00 PM

This looks interesting

but I can't find anyone who actually sells it.

jps - 10/10/18 at 07:29 AM

quote:
Originally posted by scudderfish
I need to make up some new pipes to go to my repositioned M/Cs (Girling if that makes a difference). I want to get a reasonable tool (not the clamp things that go for circa £15), but some say they only do SAE and others only do DIN. What are they, and what am I likely to need?

Regards,
Dave


Dave - what did you do in the end? A search has only thrown up a few results mentioning DIN flares so I am non the wiser! I am doing my brake lines soon so need to buy the right tool...

I will have metric fittings on my hard lines and expect I will need both male (into the master cylinder) and female (to the bulkhead joins) - but I can't find any DIN tools that do a female fitting!

Mr Whippy - 10/10/18 at 11:59 AM

It's funny but my flaring tool which is one of the £15 type has done many metric & imperial fittings no bother (old landys tend to be a right hodgepodge), I suspect there is some unnecessary over complication going on...

FamilyGuy - 10/10/18 at 04:47 PM

I used DIN flare for my hard lines. The DIN flare is a single stage flare as opposed to the SAE which is a double stage. One tool for producing the flare and the male / female fitting is determined by the unions you use.

This article explains which flare should be used depending on union type.

http://www.fedhillusa.com/?page=flare

I used one of the tools in the video and pic above and found it easy to use and consistent. Before I got one of those I struggled on with one of the cheap fleabay items which I found hopeless.

jps - 10/10/18 at 08:24 PM

quote:
Originally posted by FamilyGuy
I used DIN flare for my hard lines. The DIN flare is a single stage flare as opposed to the SAE which is a double stage. One tool for producing the flare and the male / female fitting is determined by the unions you use.

This article explains which flare should be used depending on union type.

http://www.fedhillusa.com/?page=flare

I used one of the tools in the video and pic above and found it easy to use and consistent. Before I got one of those I struggled on with one of the cheap fleabay items which I found hopeless.


So the DIN flare is the same regardless of whether it's a male 'nut' or a female 'nut' being used?

FamilyGuy - 10/10/18 at 09:32 PM

Yes, one DIN flare and different unions to suit your requirements.

jps - 11/10/18 at 08:06 AM

quote:
Originally posted by FamilyGuy
Yes, one DIN flare and different unions to suit your requirements.


Thanks - that's exactly what I could not find spelled out anywhere!!!