Copper air lines, fittings and flares?

[merlot566jka]

Hey guys, I have accidentally damaged my horn copper tube. I tried to find a cap or plug for the line, but nothing I had fit the point where the air tee'd off from the firewall. Also on the other end, that connects to the horn, I couldn't identify the fitting/flare there.

What size is the tube? What size and name are given to the fittings? What kind of flare is that?

I ended up smashing down the end of tube and pinching it over itself and taping it up until I can figure out what I need to repair it.

Any help would be greatly appreciated!

 

[frank8003]

View attachment FLARE tubing brake flare chart common flares6.pdf
Is that an inverted flare plug like I use on brake lines?

[h=3]Inverted Flare Plug (Steel)[/h]Typical application: hydraulic brake, power steering, fuel lines and transmission cooler lines. Use with copper, brass, aluminum, or steel hydraulic tubing. http://www.discounthydraulichose.com/Inverted_Flare_Plug_Steel_p/3131.htm?1=1&CartID=0

 

[merlot566jka]

Well, I don't need to plug it, I'd like to fix it. But that gives me a little to go on.

Anyone know more? I know it's not NPT...

 

[doghead]

A look at the parts tm to identify the item you're referring to, then a google search of the NSN, should get all the info you need.

For the best result, use the "nsn# and parttarget" in the search.

 

[merlot566jka]

Thanks doghead. Which TM would that be listed in? I don't frequent the TMs enough to readily identify which TM is used to identify copper flare fittings.

I was hoping to post here to get some better direction other than "search Google". I thought there were experts here who could recite this info from memory.

 

[doghead]

It depends on which TM's you have or like.

Either way, it would be in a "20" series of TM that ends with "P".

Here's an example(that should convince you).

A look at TM 9-2320-361-24P in the index, I quickly found " Air horn kit" and can click on a direct link to the page with the parts numbers and exploded view.

Then, a visual identification of what is needed is made. I then copy the nsn(and it shows in my google search bar, then I add "part target", then click enter...

I then click on the link from google and get something like this, http://www.parttarget.com/4730-00-782-5461_4730007825461_H0-172-6X2.html

All in about 2 minutes(typically).

 

[Floridianson]

I think that the copper lines that were used were thick wall, Also on the flair they double folded it to be a better end but on some it is still just a flair copper end that can be make with the hardware store flair tool. Most steel lines and some fuel fittings on the trucks use the inverted flair flair stuff or compression fittings.

 

[frank8003]

Thanks, I didn't know what they are called either but they are all over the truck.
flareless tube for copper alloy 377 3/8 tube what would be a "special fitting"

Techincal Specification: CONNECTION TYPE THREADED EXTERNAL PIPE 3RD END CONNECTION TYPE THREADED EXTERNAL TUBE 1ST END CONNECTION TYPE THREADED EXTERNAL TUBE 2ND END CONNECTION STYLE FLARELESS (TUBE) 1ST END CONNECTION STYLE FLARELESS (TUBE) 2ND END CONNECTION STYLE PLAIN (PIPE) 3RD END FURNISHED ITEMS AND QUANTITY 2 TUBE COUPLING NUT W/SLEEVE NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED 0.375 INCHES 1ST END NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED 0.375 INCHES 2ND END NOMINAL THREAD SIZE 0.125 INCHES 3RD END NOMINAL THREAD SIZE 0.531 INCHES 1ST END NOMINAL THREAD SIZE 0.531 INCHES 2ND END NONDEFINITIVE SPEC/STD DATA 3B FIGURE LEG LENGTH 0.800 INCHES NOMINAL 1ST END LEG LENGTH 0.800 INCHES NOMINAL 2ND END LEG LENGTH 0.930 INCHES NOMINAL 3RD END MATERIAL DOCUMENT AND CLASSIFICATION SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL MATERIAL COPPER ALLOY 377 OVERALL SEAT ANGLE 20.0 DEGREES 2ND END SEAT ANGLE 20.0 DEGREES 1ST END SPECIFICATION/STANDARD DATA 81343-J246 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD THREAD CLASS 2A 1ST END THREAD CLASS 2A 2ND END THREAD QUANTITY PER INCH 24 1ST END THREAD QUANTITY PER INCH 24 2ND END THREAD SERIES DESIGNATOR NPTF 3RD END THREAD SERIES DESIGNATOR UNS 2ND END THREAD SERIES DESIGNATOR UNS 1ST END

Copper		58 - 61
Iron		0.3 max
Lead		1.5 - 2.5
Remainder Each		Zn
Remainder Total		Cu + sum of named elements 99.5 min OH, LEAD! Don't go to California

 

[doghead]

Flareless = compression(with ferrule).

Common soft 3/8" copper tubing.

 

[m-35tom]

i am not aware of any flare fittings on the truck. that is generally used for liquid lines with low pressure. all the lines are just standard size soft copper, 1/4,3/8, 1/2. the fitting and nut is a finer thread than what you encounter in plumbing so you will have to re-use the old parts with a new ferrule. you can also use air brake line with a sleeve and nylon ferrule, all same standard sizes.

 

[merlot566jka]

Thanks Tom!! That hit the nail on the head!

I tried searching for the NSNs and corresponding "part numbers" but I found nothing.

I think that I will try to convert over to more common NPT or JIC.

 

[m-35tom]

Thanks Tom!! That hit the nail on the head!

I tried searching for the NSNs and corresponding "part numbers" but I found nothing.

I think that I will try to convert over to more common NPT or JIC.

i don't know that i would 'convert' to anything as long as you have all the original fittings and parts. the line is standard and of the many trucks that i have replaced all the line on, i have still kept the original fittings