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Best Fittings/dowty

Discussion in 'Technical' started by brk1, Sep 28, 2019.

  1. brk1

    brk1 Engaging Member

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    I've only recently bought a Best fittings kit so several adapters can be used so everything is new at the moment, also recently got a spare kit as well :)

    Regarding the Dowty washers, what size are they, imperial or metric, M8, 3/8 , M10? If they are uncscrewed are they a one time seal or do they want replacing when swapped between fittings ?

    Also the "O" ring inside the female quick couple part, what size "O" rings are used , most searches just take me straight to links for packets of 5 or straight to best fittings showing me the kit or parts of kits that I already have, or answer just saying get a pack from so and so. I expect they are only standard nitrile shore 70 ring ? But what size ?

    Any answers appreciated , thanks.:thumb:
     
  2. sagalout

    sagalout Apparently I need more guns.

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    The dowty washers will be 1/8" BSP available from an excellent ebayer here I have no interest in them except that I have had exceptional service from them. I ordered 10 washers, they didn't arrive, I contacted them they resent 1st class post. 3 days later the first lot they sent turned up, I offered to pay for them but they refused any payment.
     
    brk1 likes this.
  3. sagalout

    sagalout Apparently I need more guns.

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    For the O rings it might be worth asking this ebayer, once again I have had excellent service from him.
     
  4. Spray1Mark

    Spray1Mark Very Active

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    Why would you want or need to replace the O rings in the female QD socket?
     
  5. brk1

    brk1 Engaging Member

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    Thanks for the answers, my reason for asking was , not knowing what I need, if you look at tech spec for those dowtys, it says 1/8 BSP has an internal diameter 10.37 , but if you slide a dowty washer down the screw thread , it grabs the thread on the way down, with the thread being only 9.6mm or 3/8" , with materials I work with they are always labelled up as to what they are , an M10 thread is 10mm , a 100mm screw is 100mm long and so on :). With the world of "O" rings and air fittings everything seems to work to a different sytem :rolleyes::rolleyes:.

    Do you know if they of "one off" useage ?

    I might not need to replace "O" rings in the female QD, but "O" rings, do they not wear if put under pressure with fittings constantly being put in and taken out, as I said the kit is new and barely had any use yet, so simply asking questions :):). Surely you don't throw away a coupling for the sake of a worn O ring if the need arises ??

    quick edit
    Just followed your link to the Dowty seller , all explained now 1/8 bsp to 9.72mm thread :thumb:
     
    Last edited: Sep 28, 2019
  6. terry1001

    terry1001 Major Poster

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    BSP fittings don't relate to other thread sizes, it's British standard pipe so metric measurements won't work. The seals are to fit a 1/8" BSP and they will be a snug fit over the male threaded part. Generally I wouldn't suggest re-using them but you might be lucky, as they're cheap enough it's well worth keeping some spares. For most applications you probably wouldn't be swapping the fittings over, it's better to have enough of the quick release fittings to go on all your probes.
    O Rings are also 'different'. Metric ones are simple the 2 dimensions are the internal bore size and the ring thickness so a 6x2 o ring would have an internal dimension of 6mm and external 10mm. Imperial ones can be complicated so it might be worth googling the topic to see what you might need to order.
     
    brk1 likes this.
  7. bob4026

    bob4026 Posting Addict

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    In my experience at the club, the o rings in the female foster fitting is always getting ruined or lost. How, I have no idea. My female foster fittings on my bottles have the same o rings inside and in the last three years I have ruined/changed none of them.

    I would like to know the size and type tho... a mate looked into this and the o rings aren’t available from best fittings, strangely.
     
  8. brk1

    brk1 Engaging Member

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    Thank you Terry, sagalout's link to ebay actually did state the sizes involved, a lot of the other links just gave you what size the actual Dowty was without the part after it that actually says about a 1/8 BSP fitting a 9.6 -9.7mm thread, I might never need to change any "O" rings as they might just not go , but it was a case of having spares incase all of a sudden I wasn't able to fill up, like happened the other week due to a simple "O" ring on the wrong fill probe that became defunct and I was stuck with no air.

    I actually bought extras when I got the Best Fittings kit, extra quick fit adapters that came with an extra dowty, so won't run out unless I do several changes , but for the price they are I just like to have emergency back ups, many searches for that internal "O" ring haven't really brought up any results , so it's probably a case of they don't break down and won't need replacing :shrug:

    @bob4026
    But if they don't break down, why do they sell them in packs of 5 for £4.50, seems their websie has been changed about a bit, new pages don't seem to show them anymore , but some older links still work, on the same page but says fits their quick socket plugs ??

    https://www.bestfittings.co.uk/shop/fill-probes-adaptors/fill-adaptors/quick-coupler-socket-qc02/
     
    bob4026 likes this.
  9. John Entwistle

    John Entwistle Engaging Member

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    brk1 the link you provided had the seals in a pack of 5
    Some folks are heavy handed and can destroy most things others at ranges and clubs have there kit heavily used, others just like to be prepared for failures. It’s easy to see what there sold in packs
    Me and a couple of mates tend to bulk buy between us for the savings and to be prepared
     
  10. brk1

    brk1 Engaging Member

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    Hi John,That pack of 5 was only in response to @bob4026 saying they didn't sell them as spares, I'm trying to find out what size they are, I might not ever need a spare for that fitting, but I'm certainly not paying 90p each for a standard size "O" ring, If I ever find out what size they are :).
     
  11. sagalout

    sagalout Apparently I need more guns.

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    Take one out and measure it?
     
  12. brk1

    brk1 Engaging Member

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    I did think of that :) , but with my luck with "O" rings lately :laff:, I'd be sure to damage it removing it and be stuck without air for another weekend. :(. Thought this might have been a well known item as a spare, seems not though :(. I have to wait until I'm not shooting or plinking for a while and try and eek one out carefully :thumb:
     
  13. markturver

    markturver Well-Known Member

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    Do you mean the o-ring inside the female Foster coupling? I believe it's a BS009, but have seen a BS008 in one, whether someone had fitted an incorrect one I couldn't say.

    .
     
  14. bob4026

    bob4026 Posting Addict

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    Cheers for the link brk, some on their way to me now. :thumb:
     
  15. brk1

    brk1 Engaging Member

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    Just for anybody else who might ever need them, the Dowty washers were as info provided, 1/8 " BSP, upon taking off my HW100 stock for strip down and re oil, not needing a fill for a while, I took the suggestion of @sagalout and whipped out the "O" ring, measured and ordered before confirming they work, nearly right @markturver , they were actually BS010 rings, I tried over a 6mm drill bit and a 6.5mm drill bit,for internal size, measured the ring CS then ordered some BS010 , they look identical , fitted one inside the female quick coupler, then did a quick test, just went upto 180 bar no leaks at all, so pretty much 99.9% sure they are the correct "O" rings :thumb::thumb::thumb::thumb::thumb:.

    Thankyou everybody who added some input. :thumb::thumb:
     
  16. sagalout

    sagalout Apparently I need more guns.

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    Thanks for that @brk1
     

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