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Bolt tightening method

  1. Jul 6, 2010 #1
    dear all,

    in object fasteners we usually use one of the three tightening method :

    1. torque method
    2. rotation angle method
    3. torque gradient method or yield point method

    my ask is :

    1. "what's the meaning of each fasteners tightening method above?"
    2. what's the difference of each fasteners tightening method above?

    note : especially for number 3, please give me a detailed explanation....(thanks before)

  2. jcsd
  3. Jul 6, 2010 #2

    Ranger Mike

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    Science Advisor
    Gold Member

    not too sure on the gradiant method
    torque method uses a torque wrench to tighten to specific torque
    rotational method i assume means you take up all thread slack and use a wrench to rotate the fastener so many degrees until you make spec
    i do know there is a method where as you tighten the bolt and measure it for stretch length.
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