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    Discussion in 'The main mechanical design forum' started by Outofmydepth, Nov 12, 2010.

    1. Outofmydepth

      Outofmydepth Active Member

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      Will M20 threaded rod slide inside some 20mm ID tubing?

      Will M24 threaded rod slide inside some 24mm ID tubing?

      etc etc

      Thanks

      Outofmydepth
       
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    3. GarethW

      GarethW Chief Clicker Staff Member

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      I think you should be OK. I got these major diameter figures off the TR Fastenings website (great resource actually ;) ).

      M20.0 - MAX = 19.958, MIN = 19.623
      M22.0 - MAX = 21.598, MIN = 21.623
      M24.0 - MAX = 23.952, MIN = 23.577
      M27.0 - MAX = 26.952, MIN = 26.577
      M30.0 - MAX = 29.947, MIN = 29.522

      I have measured an M10 (the largest screw I had to hand) and the major diameter 9.8mm. Usually the major diameter of the thread is a tad smaller than the "M" size.
       
    4. Outofmydepth

      Outofmydepth Active Member

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      Thank you GarethW,

      I also thought of measuring a thread I have to hand which happens to be 10mm. Problem is my vernier gauge is a bit crude. I generally put things in the vice then measure the distance between the jaws!

      Outofmydepth
       
    5. GarethW

      GarethW Chief Clicker Staff Member

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      How about upgrading to one of these? You could even mark a mm scale on them with a fineliner! Bingo - you've then instantly got yourself a top-quality precision vernier that's head and shoulders about the old-fashioned "vice 'n' ruler" technique. :D
      [​IMG]
       

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