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Bolt Tension

  1. Aug 31, 2007 #1
    if i have M20x100 how many torque is needed?
    Could you explain to me its formula?
  2. jcsd
  3. Aug 31, 2007 #2

    jim mcnamara

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    Staff: Mentor

    (This thread belongs in Engineering - hint to moderator ;) )
    My copy of Machinery's Handbook 26th Edition, pp 135 and 1475-1491 go through all of this. I'd suggest that you go to a library or consult your own copy of any edition.

    The reason is: the application itself, the bolt rating, bolt coating, and lubricant can change the values.
  4. Aug 31, 2007 #3


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    Science Advisor

    Hint taken!
  5. Aug 31, 2007 #4


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    Science Advisor

    This is not a simple question to answer. There is no right answer for all situations. The answer depends on:

    - The joint design
    - The joint load
    - The number of fasteners involved
    - The pretension required in the bolt
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