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^^"the screw itself starts to yield and stretch"
Has anyone measured thread stretch in any of these bolt torque tests? I know it's impossible to measure when threading in receiver to stock bolts, but for the sake of testing, I would be curious. In automotive applications thread stretch is more important than actual torque. When torqueing connecting rod bolts I use a thread stretch gauge.
Also, as mentioned, a dry or oily bolt will torque differently (or if there is contamination on the threads). Many manufacturers give a light torque spec (35ftlbs for example) then add +90 degrees. So you torque it lightly then twist it an additional 90degrees, thus setting the correct amount of thread stretch.
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