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Confused about air compressor fittings

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Forum topic by DrTebi posted 01-11-2016 08:50 AM 3604 views 0 times favorited 18 replies Add to Favorites Watch
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DrTebi

256 posts in 2732 days


01-11-2016 08:50 AM

Topic tags/keywords: air compressor air hose fittings

Hello there,

my sweet wife got me a nail gun combo (Freeman P4FRFNCB) which I wanted for a long time. She didn’t think about the air compressor though…

I will probably go for the Dewalt DWFP55130 air compressor, ‘should be sufficient for finish nailing and the occasional framing.

What I am confused about is what hose I need. The Dewalt, and most other compressors that I have seen, have a quick-connect type of fitting, but all the air hoses that I see available, have a different fitting? Do I need to buy another adapter to connect the hose to the air compressor? The Dewalt has a 1/4” industrial quick connect type.

Can anybody tell me which would be the right hose to get, and, if necessary, which adapter?

Thanks for any help in advance…


18 replies so far

View AlaskaGuy's profile

AlaskaGuy

2406 posts in 1774 days


#1 posted 01-11-2016 09:51 AM

If the sales staff can’t fix you up with the right stuff to fit whatever compressor you buy you need to shop somewhere else.

-- Alaskan's for Global warming!

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jerryminer

528 posts in 907 days


#2 posted 01-11-2016 09:57 AM

Air hoses typically come with brass pipe threads, ready to accept the quick-connect fitting of your choice.

For nail guns, I use 1/4” hose—although 3/8” hose is ok, too, but 1/4” fittings should be plenty.

There are two common “standard” quick-connect fittings: Milton-type, and Tru-Flate type (sometimes called “type M” and “type T”). Around here, the Milton is the most common, but when I lived in another state, Tru-Flate was more common. Pick your style.

Milton:

Tru-Flate:

You can make an adapter by threading the male end of one type into the female end of another type.

View AlaskaGuy's profile

AlaskaGuy

2406 posts in 1774 days


#3 posted 01-11-2016 10:02 AM

I looked up that compressor and it say it comes with 2 universal air couplers. The universal coupler with fit the 3 most popular fittings.

-- Alaskan's for Global warming!

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AandCstyle

2574 posts in 1722 days


#4 posted 01-11-2016 01:31 PM

DrTebi, it depends on how much air you will need and the distance you will need to run the hose. 1/4” should be fine for the purposes you mentioned, but if you ever want to use an air sander at a distance you would need to go to 3/8” hose and fittings. I recently purchased a PVC hose and like it because it is lighter weight and less expensive than a rubber one. You don’t need 3/8” however.

-- Art

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teejk02

424 posts in 591 days


#5 posted 01-11-2016 02:08 PM

Don’t forget the Teflon pipe tape!

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DrTebi

256 posts in 2732 days


#6 posted 01-11-2016 06:29 PM

OK, I am a little smarter now. But as I mentioned before, it seems that all hoses come with a screw-type end, called MPT or MNPT fitting. So in order to connect nail gun and compressor, I need to get 1/4” interchange connectors, is that correct?

So I need, for example, an MPT to Industrial Interchange adapter for both ends of the hose?

I have a the Teflon pipe tape…

View MrUnix's profile (online now)

MrUnix

4232 posts in 1664 days


#7 posted 01-11-2016 06:38 PM

The hoses rarely have quick connects. They use pipe thread fittings as you noticed. Get a male quick connect for one end, and a quick coupler (female) for the other… I’ve used the HF ones and they seem to do just as good a job as any of the others: In essence, you are just extending the quick coupler that is on the compressor out to the end of the hose.

But you can get them at any of the big box stores, tractor supply, hardware stores, etc…

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

View OggieOglethorpe's profile

OggieOglethorpe

1213 posts in 1575 days


#8 posted 01-11-2016 06:56 PM

Milton makes three versions, following Alaska guy’s graphic above, you’ll see Type M, A, or I on the package. They don’t interchange well, if at all. If you look closely at Jerry’s graphic, the Tru-Flate is the same as a Milton Type A.

Lots of nail guns, including some Porter Cable examples, come with a Type M connector pre-installed.

Shop around, Milton prices can vary widely. I’m lucky to have a local tool shop, Coastal Tool, that sells all three genuine Milton variants at extremely attractive prices.

I have some of the Harbor Freight type M, and some work fine, others don’t completely seal if the female is disconnected, and a few others have gotten stuck together, where the female wouldn’t eject the male end, so I went back to buying Milton. I also have some connectors from the big box home centers, and they appear identical to the Harbor Freight versions, but function better. This may be one of those HF items where the buyer is the QC dept.

View pintodeluxe's profile

pintodeluxe

4858 posts in 2279 days


#9 posted 01-11-2016 08:22 PM

Set everything up with quick connect fittings. That way it is easy to remove the hose from the compressor, or change tools. I have always used the Milton type (type 15 in the photo above). They work fine. My compressor has a female quick connect, and the end of the hose has a male quick connect.
On the other end of the hose I have a female quick connect, and the tool itself has a male quick connect.

I run a 50’ 3/8” Flexzilla hose, which works fine. 3/8 hose is compatible with 1/4” NPT fittings, it is just a slightly larger hose diameter.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

View teejk02's profile

teejk02

424 posts in 591 days


#10 posted 01-11-2016 10:36 PM

I own 7 nail/staple guns (PC/Bostich/Dewalt). They all came with the 1/4” “male” quick connect fittings installed. If you go with a “pancake” compressor it will likely come with a hose “ready to go”. Other hoses will likely come with the threaded male…I buy those kits that include the female quick connect and other pieces (like tire inflators). Won’t break the bank.

View DrTebi's profile

DrTebi

256 posts in 2732 days


#11 posted 01-12-2016 01:01 AM

Alright, so I think my questions have been answered, thanks to everyone.

I will need a hose and couplers. That’s the part I was most unsure about.

Now I have another question… I just looked into the manual of the finishing nailer, and it says that it requires 9.39 SCFM with 100 fasteners per minute @90 psi. But that doesn’t mean my compressor does need to have 9.39 SCFM, does it? If that’s so, I am looking at a big compressor in the $800+ range

If I use a compressor with less SCFM, does it simply mean it will shoot less nails per minute, or will I not have enough power to properly seat a e.g. 2 1/2” nail?

Man this stuff is confusing… maybe I should just keep hammering by hand, but I have at least 300 lft more to go in baseboards etc!

View gfadvm's profile

gfadvm

14940 posts in 2155 days


#12 posted 01-12-2016 03:05 AM

The pressure (PSI) dictates how deep you can sink a nail. The SCFM dictates nails per minute.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

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DrTebi

256 posts in 2732 days


#13 posted 01-12-2016 06:05 AM


The pressure (PSI) dictates how deep you can sink a nail. The SCFM dictates nails per minute.

- gfadvm


Thanks, that makes more sense. The funny thing is, the online manual of the same nailer must be newer, and they took out the SCFM requirement completely.

Anyway, I went with the following items:

  • DEWALT DWFP55130 (link)
  • Goodyear EP 46504 (link)
  • Central Pneumatic 12 Piece Professional Air Tool Accessory Kit (link)

... and a few nails. Should work.

View MrUnix's profile (online now)

MrUnix

4232 posts in 1664 days


#14 posted 01-12-2016 06:17 AM

* Central Pneumatic 12 Piece Professional Air Tool Accessory Kit (link)
- DrTebi

Not to distract from your purchases… but that “Central Pneumatic” kit for $25 on amazon is an HF brand and can be had for $12 directly from Harbor Freight with a 20% off coupon (or $14.99 without one). I’m amazed that Amazon has that much of a mark-up for a HF tool.

Also, CFM (or SCFM) is pretty irrelevant to a nailer… it only shoots a short burst with each nail at the rated PSI. That is why the little bitty pancake compressors can be used. CFM is much more important for something like a spray gun or die grinder where the air stream is for the most part continuous, and the CFM rating of the compressor will dictate how long it can be run before having to kick in. Using a high demand CFM tool with a low CFM capable compressor will cause it to run continuously, and could eventually over-run the compressors ability to run the tool at all.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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DrTebi

256 posts in 2732 days


#15 posted 01-12-2016 06:27 AM

  • Central Pneumatic 12 Piece Professional Air Tool Accessory Kit (link)
    - DrTebi

Not to distract from your purchases… but that “Central Pneumatic” kit for $25 on amazon is an HF brand and can be had for $12 directly from Harbor Freight with a 20% off coupon (or $14.99 without one). I m amazed that Amazon has that much of a mark-up for a HF tool.

Cheers,
Brad

- MrUnix


Yes, but I would have to pay shipping… which I don’t with Amazon. I am not a Amazon fanboy or anything, but sometimes it just works out the best.

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