what i am trying to say is that fine thread has more threads per inch so the friction working against the torque applied is greater. However the strength of the bolt is determined by the yield strength of the steel--not the tensile strength--the limiting area is not the root diameter of the threads but a greater value A- sub t--determined by tests--and of course fine threads have a greater area than course threads so the ultimate allowed clamping force will be greater-but a slightly more torque will be required to obtain that.--In real life situations it is probably insignificant unless you have a required clamping force required. In all of NY state bridge design connection requirements it is standard to use course thread A325 7/8 diameter bolts tensioned to a load of 30000 lbs.- The torque wrenches are calibrated each day with a load cell---sometimes load indicating flat washers are used---lock washers are never used.
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