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    Established TDF Member Energy58's Avatar
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    Hardness Specification for K-Valve O Rings?

    Does anyone have the specification for the O-ring that fits in the face of an older-style cylinder valve (A-Clamp). I know the size is 111 but what shore number should I buy? T'internet seems to suggest 70 which are available. I can get 100 nitrile o-rings of unknown hardness for 10, Viton ones of known hardness cost a bit more but in the big scheme of things are still cheap so I would like to buy the correct thing.

    Every time I buy a big box of O-rings its the size that gets used up first - almost always by buddies!

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    Established TDF Member Paulo's Avatar
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    Woz had oodles of them a bit back that he was nearly giving away in the packs he put together. He could do custom packs too (I assume he still can)
    JJ wanker

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    Nicotine, valium, vicodin... notdeadyet's Avatar
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    Quote Originally Posted by Energy58 View Post
    Does anyone have the specification for the O-ring that fits in the face of an older-style cylinder valve (A-Clamp). I know the size is 111 but what shore number should I buy? T'internet seems to suggest 70 which are available. I can get 100 nitrile o-rings of unknown hardness for 10, Viton ones of known hardness cost a bit more but in the big scheme of things are still cheap so I would like to buy the correct thing.

    Every time I buy a big box of O-rings its the size that gets used up first - almost always by buddies!
    I buy my orings from Polymax. Even with the minimum order sizes they are still cheap. From memory I think 70 shore is the recommendation for sealing moving parts and 90 for anything static.
    Caliph Hamish Aw-Michty Ay-Ya-Bastard, Spiritual leader of Scottish State in England

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    Established TDF Member Energy58's Avatar
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    Quote Originally Posted by notdeadyet View Post
    I buy my orings from Polymax. Even with the minimum order sizes they are still cheap. From memory I think 70 shore is the recommendation for sealing moving parts and 90 for anything static.
    Me too! They are so cheap it isn't worth skimping to save 10p an O-ring! T'internet says 70 Shore but didn't sound super confident!

  5. #5
    All hail ZOM Woz's Avatar
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    Ideally 90 shore A for DIN (112) or A clamp (111) O rings. Send me a message and I'll sort a bag out for you. You can use softer ones no problem but you might find they pop out of the O ring groove when you take the reg off.

    Oh and don't bother with Viton it's a waste of time. Get EPDM.

    FYI M26 are 113.

    Oh and Polymax are really expensive compared to a normal supplier. But I buy in bulk so get O rings for pennies. Probably have a million of them in various sizes in the workshop...!
    I have nothing to do with BSAC any more apart from being a muggle member. So anything I write on here is likely to be complete bollocks. Hooray!


 

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