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1.  I need to tension an ASTM A490 bolt to a certain value (somewhat of a hypothetical question).  I need to calculate the torque required to achieve this tension.  Could someone tell me how to calculate the torque? 
2.  Do I need to worry about pre-tension?  If yes, will pre-tension need to be considered in the equation in item 1 above for calculating the torque?
Thanks for your help!

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