We recently had some bolts torque tested. The numbers came back 60% higher than the book value for a grade 5 bolt. The method that the lab used was as follows: They increased torque and measured the tension in the connection as the torque was applied. They stopped applying torque once they measured no increase in the tension as they rotated the head of the bolt. They said that this was the yield point for the connection. In all of my reading on torque testing for fasteners, I don't see any mention of this method. Is this a valid method and would this be very accurate? I am concerned since this bolt will be installed and removed many times in its life. Thanks.
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Lab torque test question 1
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