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Thread: Just a heads up on Tube Sizes

  1. #1
    Join Date
    Mar 2016
    Posts
    116

    Default Just a heads up on Tube Sizes

    Just a heads up for anyone who is looking for thick walled tubing, but with walls less thick than jointing tubing. I was hunting for 0.8 - 1.00mm walled tubing.

    Betts have been updating areas of their website and appear to have decided to redefine how tube wall thickness is expressed

    While the industry standard (probably across most industries, world-wide, since time immemorial, or at least the first industrial produced tubing) would seem to be (OD - ID)/2 (OD = Outside Diameter; ID = Inside Diameter), so tubing with an OD of 4mm and an ID of 3mm has 0.5mm walls. i.e. the actual thickness of the metal! Give or take, since some tubing still seems to be made on imperial measurement machinery and then sold sized to the nearest metric sizing.

    Betts have (currently, I have sent them a message) redefined it as simply OD - ID, so their OD 4mm ID 3mm tubing is said to have a 1mm wall thickness. i.e. twice the actual thickness of the metal.

  2. #2
    Join Date
    Dec 2009
    Location
    Central London
    Posts
    8,845

    Default

    Yes its the sort of typo that creeps into catalogues and websites, especially if the designer doesn't have basic maths.
    I expect quite a few of their customers are giving them a bit of stick. Dennis.

    I am fortunate that as I only make one-offs, I can devote time to drawing down a piece of tube to thicken the walls as needed, or even insert one tube into another for extra strength. Dennis

  3. #3
    Join Date
    Nov 2017
    Posts
    946

    Default

    I know this thread was a while ago but did Paul ever find some 0.8mm-1.00mm tubing? Also can you use jointing tubing for tube setting? i recently did a tube setting but i did wish the wall had been a little bit more generous. i probably should have done the one tube inside another trick but hey ho,

  4. #4
    Join Date
    Feb 2011
    Location
    West Berkshire
    Posts
    660

    Default

    I've used joint tubing for really small stones and it works very well.

  5. #5
    Join Date
    Nov 2017
    Posts
    946

    Default

    Quote Originally Posted by theresa View Post
    I've used joint tubing for really small stones and it works very well.
    thanks theresa what size of small stones? at the moment i'm using 2.5-3mm one's mostly

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