Quote:
Originally Posted by Jack Shaft
Torque value is used to place the fastener in tension after maximum clamping force is achieved
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It's my understanding that this "tension" is achieved by a specific amount of bolt/stud stretch and that the torque spec is the torque required to achieve a specific amount of stretch. This is also, to my understanding, why critical bolts/studs ( heads on high compression/high performance applications) should never be reused. They should only be "stretched" once.