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Old February 16, 2014, 10:22 AM   #14
Wyosmith
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Join Date: December 29, 2010
Location: Shoshoni Wyoming
Posts: 1,241
Yes it is, but the 620 degree temp that turns the screw blue is the same temp you draw good spring steel at. So if the screw is mild steel (which most are) there is no heat treatment in the first place, so nothing is affected.
If the screw is made of a better grade of steel it will do nothing to affect them badly, and can possible make them better.
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