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  1. #1
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    Default Changing to Nitto. What size?

    Well I have had enough of Ryco quick connector air fittings. Been using them for decades but when I get greasy hands I can not pull them off.

    Also you now seem to get some that while they hook together, no air flows as the centre hole is too big to push down the plunger.

    So have decided to just bite the bullet and go to Nitto. But I see Nitto come in different sizes, a 20, 30 and 40.

    Which is the common size? I know to buy genuine female parts, but the male parts being just a pointy thing with a hole should fit no matter what country of origin.
    Gold, the colour of choice for the discerning person.

  2. #2
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    Default

    Haha beware I have had a number of cheap crappy Nitto fittings that were not interchangeable. Also I find they suffer from not liking being dropped on the floor constantly, they then either become hard to pull the collar back or wont seal.

    I think monotaro were selling genuinely good Japanese made ones a while back. I bought some and was impressed.

    I actually didnt know there were different sizes though.

  3. #3
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    The 20,30,40 represent your air line size 1/4",3/8" or 1/2".

  4. #4
    BobL is offline Member: Blue and white apron brigade
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    Default

    Quote Originally Posted by .RC. View Post
    Well I have had enough of Ryco quick connector air fittings. Been using them for decades but when I get greasy hands I can not pull them off.
    Also you now seem to get some that while they hook together, no air flows as the centre hole is too big to push down the plunger.
    YEs watch out for cheap on-line types as these are the one most likely to do that.

    So have decided to just bite the bullet and go to Nitto. But I see Nitto come in different sizes, a 20, 30 and 40.
    It depends what models you wish to use and what size hoses you use.

    The 10,17,20,30 and 40, 400, 600 and 800 sizes are typically those available for the High Cupla series.
    The 10 provides a nominal 13mm2 cross section, the 17 gives a 16mm2 cross section, the 20 gives a 21 mm2, the 30 and 40 both give 41mm^2.etc.
    The 20/30/40 will all work with each other.

    If you use an 8 mm ID hose you have 50 mm2 of area but if you end up using a barbed fitting that will be nominally ~6mm ID so 28 mm2. so its not worth using a 40 but its worth using a 30.
    If you use a 6 mm ID hose (~4mm ID of the barb) you have 12.5 mm^2 so its pointless using anything bigger than the 20 and you might as well use the 17.

    The next thing is if you have to buy a bundle of them then finding the larger and smaller ones at a half decent price becomes an issue.

    As it so happens my Nitto style retic comp air system has started leaking leaking recently and most of the issues are with cheap fittings and so I am slowly replacing them with genuine Nittos. My system has 8 take off points (female) and 4 of these have hoses permanently attached which makes for a total of 12 female and 4 male fittings. Then the air guns and tools all have males fittings.

    When I put my system together I bought a number of different Nitto style fittings (ie genuine Nittos and some no names). The no names were made of different materials (brass, steel, Al) from a number of sources including Bunnings, Supercheap and a few places on-line. 7 years later and leaks correlate closely with use (ie those air points I use most often were the leakiest) and the following. All the Al males are shot, pitted and corroded around the seat edge. The steel spring and valves in the non-Nitto females I use regularly are mostly corroded from water. The 3 Nittos I have are all OK.

    My system is 1/2" galv pipe but Im using 10 mm ID hose extensions with ~12 mm barbs that have a 7.5 mm ID that gives a 44mm^2 so I should use a 40 for max flow. However, the last time I looked I could not find any 40s anywhere near as cheap as the 30s at Supercheap. Supercheap often have specials etc and then next time that happens I'm going to stock up to replace the remainder.

    Which is the common size? I know to buy genuine female parts, but the male parts being just a pointy thing with a hole should fit no matter what country of origin.
    Yes and no, if the male part does not fit well then of course the likelihood of leaks increase. They may well appear to fit and not even leak when you test them but then, if the hose or connection is held at an odd angle they slowly start to leak. The genuine males are not that expensive anyway.

  5. #5
    Join Date
    Jan 2018
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    Aldinga Beach.
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    Default

    I had Jamec type fittings for years but noticed that most air tools come with Nitto type fittings so I shelled out and replaced the Jamec with Nitto. What a mistake! I found the Nitto fittings a PITA, definitely not suited for those with arthritic hands so I swapped back to Jamec - chalk and cheese!

  6. #6
    Join Date
    Aug 2006
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    Melbourne
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    Default

    I've always used nitto fittings at home without any issues. I just go with the cheap steel fittings.

    https://www.ebay.com.au/itm/10-PC-AI...oAAOxyVaBSzqzH

    https://www.ebay.com.au/itm/10-x-Air...QAAOSw4CFYt83a

  7. #7
    BobL is offline Member: Blue and white apron brigade
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    As far as hands go I had slightly more problems with the Jamecs at work than with my Nittos at home. My left hand has slightly mangled index and middle fingers and I found I could not produce enough side pressure to release the fittings. This may probably had something to do with the higher pressures system being used at work.

    I find the larger Nittos (40s) much harder to "push on" than the smaller ones - this makes sense as the cross sectional area is twice that of the 20PMs. One issue with the Nittos is they can sometimes come apart when a fitting is pulled past a sharp edged object like the corner of a bench or machine. This is only a problem if there is a fitting somewhere along a hose - if the fittings are only at each end of the hose then this is unlikely to occur.

    It's not that big a deal in most cases but my experience with cheaper on-line fittings is that they are nearly all 20PM. The on-line supply of cheap 30 and 40PM appears to be limited and the genuine ones are similarly priced or more expensive than places like supercheapauto, especially when SCA have the genuine ones on special.

    I see Jamec now actually make Nitto fittings and one on-line supplier even has some 30PMs available in steel. I've only seen older Jamec fittings available in steel and the newer ones appear to be brass. It depends how well you can reduce the moisture content in your compressed air system but beware of mixing fittings made of different metals as galvanic corrosion can be a problem. This appears to have been a contributing factor with the several Al/steel fittings I had on my system.

  8. #8
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    Default

    I bought some nice brass Jamec fittings from Bunnings, only to get them home and find they were actually aluminium.

  9. #9
    Join Date
    Jan 2012
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    Default

    Don't forget about the "one touch" Nitto fittings, the collar stays retracted after disconnection.
    I am also getting arthritic hands; they really help when connecting.
    Can't remember how much extra they cost.
    Neil

  10. #10
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    Thanks. I understand it all now.

    The 200 series are the one touch series and come in 20, 30 and 40 sizes.

    But they are fully compatible with the normal 20, 30 and 40 sizes.

    I run 3/8 and 1/2" sized hose.
    Gold, the colour of choice for the discerning person.

  11. #11
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    Richard I've swapped to Nitto and find them much better. Higher flow than the old ones. I often stock up on genuine Nitto brands from Field Days, as they're often so cheap as to be a no-brainer. The Nitto rep gave me a demo of the safety couplings they do, and they're very good. I think they would be ideal for anyone with difficulty in handling conventional connectors. I've had hoses release unexpectedly and it's not ideal.

    Their female couplings have a seperate valve to the securing mechanism. They don't give them away, but generally speaking you only need a few females in a workshop, with most fo the fittings being male. He's a video of them in use.
    https://www.youtube.com/watch?v=FSa9-oEbrSk

  12. #12
    BobL is offline Member: Blue and white apron brigade
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    Quote Originally Posted by Pete F View Post
    Richard I've swapped to Nitto and find them much better. Higher flow than the old ones. I often stock up on genuine Nitto brands from Field Days, as they're often so cheap as to be a no-brainer. The Nitto rep gave me a demo of the safety couplings they do, and they're very good. I think they would be ideal for anyone with difficulty in handling conventional connectors. I've had hoses release unexpectedly and it's not ideal.

    Their female couplings have a seperate valve to the securing mechanism. They don't give them away, but generally speaking you only need a few females in a workshop, with most fo the fittings being male. He's a video of them in use.
    https://www.youtube.com/watch?v=FSa9-oEbrSk
    Thanks for the Vid link. I really like the look of the Hi Cupla PVR fittings but the females cost ~$170 so that kind puts it out of my league. I had a look on Blackwoods website and I see the prices for their 40s are not as high as I have seen elsewhere.

  13. #13
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    Default

    Quote Originally Posted by BobL View Post
    Thanks for the Vid link. I really like the look of the Hi Cupla PVR fittings but the females cost ~$170 so that kind puts it out of my league. I had a look on Blackwoods website and I see the prices for their 40s are not as high as I have seen elsewhere.
    The ones I saw definitely weren't that expensive, but can't recall the price. I guess there are different versions and it may be possible to find a cheaper version.

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