"Torque to yield - also called "stretch" - bolts seem to help as they increase the clamping force applied. They are NOT re-usable - regardless of how many bubbas or Billy-bobs have gotten away with it. Once stretched to the yield point, they stay stretched. Re-stretching them will either break them or seriously weaken them."
Who you calling Bubba?
From the Bubbas and Billy-bobs At Cummins;
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I am not saying all Torque to yield head bolt are reusable but I have used these gauges that come right from Cummins many times to check and reuse head bolts and have never encountered a failure.
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