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Tested - D.O.T. Fittings versus Home Depot Fittings

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Old 07-10-2006, 10:26 PM   #1
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Tested - D.O.T. Fittings versus Home Depot Fittings

To properly evaluate the quality of Home Depot fittings versus D.O.T. approved fittings, multiple samples should be tested. The following encompasses the testing of only one set of samples.

Samples in question included six (6) Watts® 1/2" Male thread to 1/2" tube compression fittings, examples of which are shown below. (click any small images for larger version)




Contrast samples included six (6) Parker® 1/2" Male thread to 1/2" tube PTC fittings, examples of which are shown below.




D.O.T. tubing was used for this test. Just feeling the tubing at Home Depot should send a chill down the back of anyone who is shopping for plumbing for an air ride air management system. Shown is a square cut example of DOT tubing used and a side by side of the example test assemblies.




The compression fittings were torqued to 20 ft-lbs.




Both samples were air leak checked to 700 psi with no leaks. The samples were then water burst tested at which both burst tests ended at 1500 psi when the tubing failed as shown.




Fittings 3 and 4 of each type were then retested in the air leak check machine. This time, the Home Depot compression fittings failed at 720 psi when the tubing blew out of the fitting.



The D.O.T. Parker fittings held out to 950 psi until the tubing bubbled. This time the tubing bubbled at a lower pressure because the fluid inside was air and was increasing much slower. During the burst test, the pressure increased so rapidly that the pressure made it to 1500 before tubing failure. Shown here is the air leak check Parker fittings.




Last, fittings 5 and 6 of each type were assembled and placed in the tensile machine. The results here were a disappointing 100lbs force for the Home Depot compression fitting to release the tubing. The Parker D.O.T. fitting withstood 300lbs tensile force and the test only ended due to tubing failure.



Here you can see the tubing just before failure during the Parker fitting test.





For shits-n-giggles, Home Depot plastic PTC fittings were air leak checked. They leaked at 450 psi.




Again, to best evaluate these fittings, multiple samples (30+) should be analyzed and the results averaged to give a more accurate comparison. However, perhaps this helps shed some light on Home Depot fitting performance versus D.O.T. fitting performance.

Having the two side by side and seeing how the cheaper fitting is damaged easier and fails at less pressures and forces, I personally would much rather spend a couple dollars more to have fittings that are approved to be on a motor vehicle and withstand the abuse that they will see over many years of operation.
Old 07-10-2006, 10:31 PM   #2
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

I love you man ha ha.

Man I want one of everyone one of those tools. ha ha..

Lucky man you have a cool place to work.

Nice info BTW
Old 07-10-2006, 10:34 PM   #3
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

good deal...
Old 07-10-2006, 10:40 PM   #4
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

5/8" Tube home depot fittings are not even close lol that would have been an unfair test ha ha.
Old 07-10-2006, 10:53 PM   #5
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

haha i read through the whole thing thinking I was reading dj's work....


good comparison man
now when someone asks "is it ok to use home depot fittings" you can point them here
Old 07-10-2006, 10:53 PM   #6
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

yay! now maybe not so many people will use home depot fittings!!
Old 07-10-2006, 11:00 PM   #7
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

added to sticky.
Old 07-10-2006, 11:06 PM   #8
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

I spend enough time in home depot bying stock for work and DOT isn't much more $$$ some might as well always use the good shit
Old 07-10-2006, 11:09 PM   #9
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

so, who do you think is going to be first to say "i've had home depot fittings on my truck for x amount of miles and no problems, blah blah blah... i'm an idiot... blah blah blah" ?
Old 07-10-2006, 11:25 PM   #10
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

Quote: Originally Posted by BlackEsDime
so, who do you think is going to be first to say "i've had home depot fittings on my truck for x amount of miles and no problems, blah blah blah... i'm an idiot... blah blah blah" ?

Give it one day lol
Old 07-10-2006, 11:34 PM   #11
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

i have had home depot fittings on my truck for 2 years


























and they suck ass
Old 07-11-2006, 12:13 AM   #12
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

Swagelok

We use just about every single product that they make at work.


Swagelok FTW
Old 07-11-2006, 12:21 AM   #13
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

nice work 98ss.
Old 07-11-2006, 01:53 AM   #14
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

good info
Old 07-11-2006, 05:16 AM   #15
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

is it just me or for our applications of 140-200 (sometimes higher) psi it seems that home depot fittings will work perfectly fine? both the parker and home depot fittings withstood the burst test up to 1500 psi in which case the line failed, A+ for both fittings. 720 psi for a line to blow out of the tank does not seem unreasonable to me, especially when we're using less than a 1/4 of the pressure it popped out at.

I am not trying to start a war, but my understanding is that those results are good enough to say that home depot fittings can be used on air ride suspensions up to, and exceeding, 200 psi. Please fill me in on your reasonings before the flaming starts....
Old 07-11-2006, 05:18 AM   #16
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

for the record, I am not using home depot fittings - SMC plastic PTCs and SMC brass with an ~ 2psi leak at 145 psi in 12 hours. I am happy with my fittings and would definitely spend the little bit extra money for my stubborn mindsake
Old 07-11-2006, 06:48 AM   #17
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

700 psi is still fine for me.
Old 07-11-2006, 09:00 AM   #18
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

What about d.o.t. compression fittings? Are you able to try those? I'd be interested to see d.o.t. compression vs. d.o.t. ptc.
Nice test though, props for taking the time to do all of that!
Old 07-11-2006, 12:10 PM   #19
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

Very nice work Tim!!
Old 07-11-2006, 12:23 PM   #20
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

Yeah I was wondering the sane thing. How much of a performance difference is there with a DOT compression fitting and a Homedepot compression fitting. I personally love ALKON ptc's . Make my ife so easy lol.. Amazing job with the test. Sounds like you work in a lab like I do.
Old 07-11-2006, 01:50 PM   #21
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

Well heres the deal:

Sunday afternoon. Just finishing up your weekend project.

BAMN! I need a fuggin' 1/2 compression union!

Gotta drive this truck to work tommorrow. Can't order online. Lets see whats open...

Well, Home Depot is still open.

Thats usually how it goes for me.

GREAT test thread though. I was wondering when someone would do something like this.
Old 07-11-2006, 02:05 PM   #22
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

great work tim.



Quote: Originally Posted by 98SS

Both samples were air leak checked to 700 psi with no leaks. The samples were then water burst tested at which both burst tests ended at 1500 psi when the tubing failed as shown.

so basically even though this test cant compare reliablity over time or a real world daily setup,

it shows that they can hold up to 700 psi...
Old 07-11-2006, 03:53 PM   #23
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

Quote: Originally Posted by Dragginbody
so basically even though this test cant compare reliablity over time or a real world daily setup, .
Not the first one, no .... but, I did the test again to the point of failure.

Quote: Originally Posted by 98SS
Fittings 3 and 4 of each type were then retested in the air leak check machine. This time, the Home Depot compression fittings failed at 720 psi when the tubing blew out of the fitting.



The D.O.T. Parker fittings held out to 950 psi until the tubing bubbled. This time the tubing bubbled at a lower pressure because the fluid inside was air and was increasing much slower. During the burst test, the pressure increased so rapidly that the pressure made it to 1500 before tubing failure. Shown here is the air leak check Parker fittings.

Old 07-11-2006, 09:24 PM   #24
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

nice thread man . i have a shit ton of fittings all dot. from freightliner for sale if any one needs them. im running hydrolic line so i no longer need them. spelling lol
Old 07-11-2006, 09:36 PM   #25
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

your comparing apples to oranges thought...

should have tested home depot compression vs parker compression fittings....

altho you get props for doing this
Old 07-11-2006, 09:58 PM   #26
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

Quote: Originally Posted by x00
should have tested home depot compression vs parker compression fittings....

I know. I don't have any D.O.T. compressions, and really don't care for compressions period. PTCs are just too user friendly and work great. I used PTCs on my truck so I had some left over. I can get some compressions and have the data amended to the post later.
Old 07-11-2006, 10:06 PM   #27
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

Quote: Originally Posted by 98SS
I know. I don't have any D.O.T. compressions, and really don't care for compressions period. PTCs are just too user friendly and work great. I used PTCs on my truck so I had some left over. I can get some compressions and have the data amended to the post later.

Anything you need changed just let me know man.
Old 07-12-2006, 09:05 PM   #28
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

Quote: Originally Posted by 98SS
I know. I don't have any D.O.T. compressions, and really don't care for compressions period. PTCs are just too user friendly and work great. I used PTCs on my truck so I had some left over. I can get some compressions and have the data amended to the post later.
ya man i hear you. PTC's are the shit! i got them on my truck too, SMC tho.

was just pointing out that you can't really compare compression vs PTC..i am almost positive that parker compressions would yeld about the same result as home depot fittings.
Old 07-24-2006, 12:58 AM   #29
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

What about AN fittings and SS PTFE line?

Are those just for fluids... or would they work for air?
Old 07-24-2006, 01:51 PM   #30
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

as mentioned this proves that home depot fittings are good to use if you run a normal 150psi system. if you go higher psi go with dot, so people can still and will say they've had no problems with home depot fittings.

great tests though, but as mentioned and to me is the bigger battle would be compresion vs PTC all DOT style. i use DOT compression and dont trust PTC (never used them) just dont seem safe to me. i'd be very interested in seeing those tests.
Old 07-24-2006, 01:59 PM   #31
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

very good info
Old 07-24-2006, 02:09 PM   #32
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

I'm going to need to see the calibration certificates for all that equipment.....

J/K


...sorry it's my calibration humor, I'm a Metrologist.
Old 07-24-2006, 02:51 PM   #33
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

Quote: Originally Posted by 1lowGMC
I'm going to need to see the calibration certificates for all that equipment.....

J/K

...sorry it's my calibration humor, I'm a Metrologist.


And I'm an engineer, so you're in good humor. If it's just necessary, they were calibrated June 5, 06.
Old 07-26-2006, 11:29 AM   #34
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

Quote: Originally Posted by projo198
Well heres the deal:

Sunday afternoon. Just finishing up your weekend project.

BAMN! I need a fuggin' 1/2 compression union!

Gotta drive this truck to work tommorrow. Can't order online. Lets see whats open...

Well, Home Depot is still open.

Thats usually how it goes for me.

GREAT test thread though. I was wondering when someone would do something like this.

if you have a bagged truck, you SHOULD have some extra fittings airline and bags. i even keep a spare compressor laying around.
Old 07-30-2006, 06:50 PM   #35
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

what about comparing both compression, instead of Comp/PTC? DOT vs. Home Depot.

I use and sell mainly compressions (DOT of course) but I'd like to be able to show some comparison between DOT/Home Depot compressions.

this obviously shows whats better thanks alot.
Old 07-30-2006, 09:02 PM   #36
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

Quote: Originally Posted by rmrider
is it just me or for our applications of 140-200 (sometimes higher) psi it seems that home depot fittings will work perfectly fine? both the parker and home depot fittings withstood the burst test up to 1500 psi in which case the line failed, A+ for both fittings. 720 psi for a line to blow out of the tank does not seem unreasonable to me, especially when we're using less than a 1/4 of the pressure it popped out at.

I am not trying to start a war, but my understanding is that those results are good enough to say that home depot fittings can be used on air ride suspensions up to, and exceeding, 200 psi. Please fill me in on your reasonings before the flaming starts....
i'm with this guy..im not out trying to say home depot fittings are ok to use, but they are being tested at almost 4x what most normal setups would see right? If these fittings were blowing out at 150-200 range, thats a clear sign not to use them. I may be talking out of my ass here but when someone asks the question" is it ok to run 200psi in a tank rated at 150psi" most people respond that is like 4x under what it can truley hold (800psi). So lets say pressures were to be that high with air ride, wouldn't we be seeing tank failures, tanks that we all run on our systems, along with home depot fittings?
Old 07-30-2006, 09:49 PM   #37
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

my HD fittings have been fine to 240 psi many times

but I'm slowly phasing them out for parker PTC's because I change my setup so much that I'm tired of having to buy new compression ends
Old 07-30-2006, 10:38 PM   #38
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

Quote: Originally Posted by BlazinLE
what about comparing both compression, instead of Comp/PTC? DOT vs. Home Depot.

I will be ammending D.O.T. compression data to the first post soon.
Old 05-02-2007, 01:54 AM   #39
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

wow there is way too much abriviations.. in this post...


im pretty sure its in there but what about fittings from an autopart store.. napa for example.
Old 05-02-2007, 08:28 AM   #40
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

It's funny that you bumped this thread up. The Parker compressions actually just came in yesterday. Finally.
I will be revising this test information within the next week, but since you mention it, I'll swing by a Napa while I'm out this afternoon and see what they have.
Old 05-02-2007, 09:02 AM   #41
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

yaaaay!!!
Old 05-02-2007, 07:56 PM   #42
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

Quote: Originally Posted by sadexcuse4s10
my HD fittings have been fine to 240 psi many times

but I'm slowly phasing them out for parker PTC's because I change my setup so much that I'm tired of having to buy new compression ends

im getting ready to do the same thing. My HD fittings dont leak(my setup runs at 200psi), but god i change my setup all the time cause the bed is constantly coming off and iv been moving shit,, iv prolly been through like 500 crush collars already lol
Old 05-02-2007, 08:26 PM   #43
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

yeah thats the only thing that sucks about compressions. if you ever blow a line somehow then you have to have a new insert and collar for each fitting before you can replace the section of line. ptc's you just unplug and push the new line in!
Old 05-03-2007, 01:20 PM   #44
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

i was talking to a guy that works a evco in utah and he said that the plastic smc fitting arent made for 200 psi thats why i have leaks all the time. so i just bought dot.
Old 05-03-2007, 01:26 PM   #45
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

ive had my plastic smc up to 280psi ..no probs at all, i have them on the bag and off the fill valve tee
Old 05-03-2007, 03:54 PM   #46
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

Quote: Originally Posted by projo198
Well heres the deal:

Sunday afternoon. Just finishing up your weekend project.

BAMN! I need a fuggin' 1/2 compression union!

Gotta drive this truck to work tommorrow. Can't order online. Lets see whats open...

Well, Home Depot is still open.

Thats usually how it goes for me.

GREAT test thread though. I was wondering when someone would do something like this.
Old 08-07-2007, 06:44 PM   #47
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

All you guys arguing this sayin HD fittings are okay to use are complete morons.Yeah they work okay an some of you have had them on your ride for a few years BUT they were not made nor ment to be used on a suspension system...That be the case trucks repair shops would be going out an using HD or Lowes fittings on semis an whatnot..Use your freakin head....
Old 08-07-2007, 07:06 PM   #48
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

Quote: Originally Posted by lowblaze2003
All you guys arguing this sayin HD fittings are okay to use are complete morons.Yeah they work okay an some of you have had them on your ride for a few years BUT they were not made nor ment to be used on a suspension system...That be the case trucks repair shops would be going out an using HD or Lowes fittings on semis an whatnot..Use your freakin head....
I agree

BTW ZOMBIE POST ALERT

yes the HD fittings are good to 700 psi and you only run 200 right.....? WRONG! when you fill a bag the pressure inside is multiplied . and if your hopping as you hit the ground you could be doing 8-10 times as much pressure in those bags and anywhere upstream, that doesn't have a check valve. this is the same reason air hoppers blow bags and lines so easily.

so lets see 200 psi x the weights natural effort to stay down (untill upward momentum is achieved) = Easily over 700 psi. (actual pressures would depend on your trucks weight)

while yes its a very short period of time and most likely wouldn't blow it does let in the possibility (too much possibility for my liking) in that respect no Home Depot fittings are not capable of handling the load.
Old 12-09-2007, 07:16 PM   #49
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

Oh noes! Thread diggin'!

Question...obviously don't get the compression/PTC fittings, but what about Home Depot 1/2" plugs for the tank?
Old 12-09-2007, 10:14 PM   #50
Anybody got 20's?
 
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Re: Tested - D.O.T. Fittings versus Home Depot Fittings

Quote: Originally Posted by The-other-doug
I agree

BTW ZOMBIE POST ALERT

yes the HD fittings are good to 700 psi and you only run 200 right.....? WRONG! when you fill a bag the pressure inside is multiplied . and if your hopping as you hit the ground you could be doing 8-10 times as much pressure in those bags and anywhere upstream, that doesn't have a check valve. this is the same reason air hoppers blow bags and lines so easily.

so lets see 200 psi x the weights natural effort to stay down (untill upward momentum is achieved) = Easily over 700 psi. (actual pressures would depend on your trucks weight)

while yes its a very short period of time and most likely wouldn't blow it does let in the possibility (too much possibility for my liking) in that respect no Home Depot fittings are not capable of handling the load.
Wrong the pressure is not multiplied. It still will be measured in pounds per square inch. There will be just more volume of that air. And for everyday driving the fittings will be fine. Even hitting a big bump in the road there will be a short raise of pressure but will never even get near 700psi.
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