NJATC Torque

Card Set Information

Author:
johnbowens
ID:
55501
Filename:
NJATC Torque
Updated:
2010-12-12 23:52:09
Tags:
torque
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Description:
torque
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  1. How is the grade of a bolt determined? WB9

    An SAE bolt thread size is determined by measuring what? WB9
    By adding the number 2 to the number of hash marks on the bolt head

    threads per inch
  2. An ISO bolt thread size is determined by measuring what? WB10
    mm form crest to crest
  3. the length of a bolt is determined by measuring what? WB10
    The length of the shaft
  4. The formula for torque is what? WB1
    Torque = length x force
  5. The fastening process is comprised of four distinct phases. WB7
    • Run Down
    • Alignment
    • Elastic
    • Plastic (yield)
  6. The total force required in a torque application is comprised of two distinct regions. What are they? WB6

    Defined how?
    • Static breakaway torque
    • Dynamic applied torque

    • Static breakaway torque: the friction the fastener must overcome
    • Dynamic applied torque: the torque required to move or rotate the fastener after it has been seated
  7. What is the 90/10 rule regarding friction? PP7
    90% of torque is friction and 10% is stretch

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