Air quick fit coupling dimensions

Does anyone know of somewhere that gives actual dimensions of quick fit air coupling bayonets/adapters. Preferably one that uses the type numbers not some obscure terms such as maker, industrial, automotive etc.

John

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This page gives official coupling series numbers and profiles but, unfortunately, not the dimensions **LINK** .

Given the proper series number it should be possible to track down actual sizes.

Clive.

Try browsing here, John **LINK**

http://www.accltd.com/products.asp?category=Quick+Release+Coupling&subcategory=19+PCL+Vertex+Quick+Release+Couplings

MichaelG.

I was going to use PCL and then remembered I have some air tools. Looking at those they use what some call industrial. This style seems to be type 14 however no info i can find gives the same sizes. Also I think called Aro or something like that. There is also a very similar style that is often called automotive.The round bit on the end is shorter,

The fittings on the tools could be type 19 as well.

Then I thought change the fittings on the tools. Turns out that they are NPT but the od is 10.5mm which seems a little big for 1/8 npt. They are more or less parallel so maybe they were forced in and made over size on purpose.

PCL seems to be out anyway as 1/8" pipe doesn't seem to be available and I do need that or would have to use multiple adapters.

I suspect the best answer will be 1/8 npt bspt equal male to bspt converters and then a fitting that looks to be about. from several sources That's euro, massive or type 21 mini.

John

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Edited By Ajohnw on 02/01/2017 16:01:53

John, have a look at this
**LINK**

BobH

That looked promising Bob. Some dimensions. The end of the bayonet on the air tools is a touch under 5/16 dia so I'm pretty sure it's a variant of the one some call industrial. The automotive one just has a shorter 5/16 dia section. Mine seems to be a bit longer than both.

The mini 21 is the same sort of thing with the end length between the 2. Rating usually 35 bar and cheap compared with some.

I'm cautious as I have never had much to do with compressed air and fittings other than some work on fluidic stuff. Even so I am aware of things that should fit together and either don't lock or leak etc. Best bet seems be to get some mini 21 stuff all from the same source and maker and give up on trying to decide what the tools have fitted.

John

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Hi all,

out of interest are u thinking of making ur own fittings........?

I've been using a Swedish brand of fitting so long that I can't read the name anymore......still not leaking(20 years)

My point is that these male fitting are very hard, as in when I droped my 1/2" air gun the other day it shattered.....

I did get some beutiful brass ones, they were OK on blow guns and the like but air wrenches just vibrated them untill they wore away and leaked......

when I finally move I intend to buy a whole new set and some extras and donate the old ones to friend.....

Cheap fittings don't work, well at least not for long and mine get used every day....incidentally they are 8mm i.d.

the soft/cheap steel fittings just ruin the "o" rings very quickly........I normally pay £8-10 per female fitting and around £2 - 2,50 per male.....

hope this helps.......buy the best once and forget........

A good New Year to all.......Clogs

Clogs, are they CEJN? Have used this make for 29000 psi hydraulics.

Martin

The hose tail fitting will cost £5-20 plus vat - which I wont get back. £12 plus vat if Rectus made them. If PCL a bit more than the £5.20. The adapters are all £1.xx plus vat. It seems they go by the name of Norgen Mini too.

Part of the reason for using them is what I need to do and usage wont be high. Seems that they are popular.

If I went for Schrader heavy duty the coupler would cost £45 plus. Standard duty about £25. Some others a lot less. Stainless even more.

I did think of making some of my own due to looking at ebay and some other prices but things look a lot cheaper from people who just supply this sort of thing who I assume also supply the others. It would just have been a thread changer if I had made anything. The hose tail on the welder isn't nice if it needs changing over. I'm going to try a quick fit on it. If that doesn't work out change it to a nipple fitting later but that will need more work.

John

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Edited By Ajohnw on 02/01/2017 20:18:22

Seeing 8mm bore tubing mentioned I went for 6mm bore for use with the welder. For plasma and argon it's more than ample and needs to be flexible.

I bought 8mm for the main compressor lead. Turns out some one is selling them based on outside diameter. The 6mm bore stuff has a larger OD.

John

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Surprising! I thought that most Schrader and PCL fittings used 1/4 BSP threads on the usual 5/16 bore airline sizes.. Depends up on the size, obviously fittings for larger bore lines will be 3/8 or 1/2 BSP, but they don't sound like the ones under discussion here.

Howard

It's possible to buy tail ends for flexible pipe for a variety of bore tubing and bsp fittings. Then there are several types of clip to hold the pipe on the tail end.

When I've looked at flexible pipe the bore size has always been clearly stated as that's what matters for flow. The compressor line I've bought said 8mm so expected 8mm bore. It's 8mm od. The end fittings are 1/4 bsp but several sizes can be used there for pipe in this size range.

I went for 6mm flexible as argon will be at around 7l/min. Air about 100l/m but only for maybe 2ft. The airline to the compressor is 5m long. I doubt if this will mater but I'm dam sure it wouldn't if it had an 8mm bore.

John

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Do you have a BML Hayley store locally?

I took samples of the variety of fittings I had and came away with a parcel of replacements.

All working, all interchangeable and has removed a stupid frustration from my workshop life.

That's a thought. I have found another company that just sells air fittings. I don't think that there will be any problem using them but if there is I could use those people but not that pleasant a drive to them.

The problem I have with the fittings on the few air tools I have is that some one makes a coupling that will work with all of the variations. Or should but a better option seems to be to switch to one where all makes seem to be interchangeable. I would probably picked euro but can't see a 1/8 bsp fitting for it. I need that to make changing the welder over from air for plasma to argon for tig easy. All I need do is saw some of the pipe tail end on it off as it leaves plenty of 1/8 bsp thread for an adapter.

They hold the internal gas valve in place with the tail end plus a lock nut. The tail end is a bit of a let down compared with the rest of it - it needs clips to hold the pipe on. They provide a couple.

John

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The seller has removed the 8mm from the description in the listing on the air line so I have requested a return on the basis that it doesn't match it - them to pay return costs. I had another returns some months ago. An electric motor. The seller stated very clearly that returns were accepted. I thought I had a problem as it would cost over £10 for me to send it back. Turned out that ebay have sorted something out and the cost to the seller was about £2.

Anyway I've ordered a branded PCL air line. Couldn't get the one I ideally wanted so had to be 10mm bore so has 3/8 end fittings. 8mm is available with 1/4 ends. PU this time. It's got a swivel on one end. Just hope it doesn't leak with use.

John

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Has anyone tried these, they are automotive/uni/hi flo dependent where you see them.

**LINK**

Looks to me like Wolf have introduced their own. The main difference between the types you mention is the round bit on the end that goes into the coupler. Automotive ones are short and industrial are long. Those looks somewhere in between to me. I didn't keep a link but a web page shows the difference between those 2 types but from memory the person that put the page up carries 3 versions around with him to make sure they fit. He also mentions that universal couplers are becoming available that should work with all of the variants.

All I know is that at a branch I worked at that had a garage and used air tools they sometimes had problems with the things not fitting together properly or not lasting very long and leaking.

I intended to use PCL fittings but they are a bit long to have sticking out of the back of a welder and might get bent. I suspect people would be safe with those even if they aren't made by PCL. The other one that should be ok as it's a sort of standard goes by the name of Euro. A bit like the Wolf ones you've linked to. If you look on the screwfix site you'll see Euro and PCL also another that PCL has introduced. XF I think, may be the same as Euro. Toolstation do traditional PCL.

Don't blame me if it goes wrong but for the sort of big hole fitting you've linked to I'd choose Euro. In fact I am going to have a trawl those that style again to see if I can use them. I've sorted a list of type 21 mini connections out and run into the need for more adapters than I thought. I'll need adapters to use Euro. Might turn out to be less. The air tools I have turned out to use and odd adapter and npt threads. That doesn't help. In the UK BSP seems to rule and the German compressor I bought also uses BSP. Seems there are some metric pipe threads too but not much sign of them.

John

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Euro works out a lot cheaper for what I need to do. Since looking initially I've found some 1/8 bsp ones.

The easiest way to see what they look like is to search euro 1/4bsp on ebay. I bought 2 of these because the coupler on the compressor is Euro. They fit it perfectly with a nice positive click. I believe that they are 14bar but there may be some variants that go higher. They turned out to be in a SIlverline package. This might be the listing. Talking to a supplier there is a good chance that any sold as Euro will fit together well.

**LINK**

PCL XF may be different. It seems that they may also do one that they call Euro. Might be they same thing or might not.

John

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