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Do you reduce the torque setting when using thread locker?

I’m a mechanical engineer and have specified this stuff for years. I wouldn’t de-rate. I also wouldn’t bother with a torque wrench on a dry fastener. If you care enough to torque it, then care enough to have the appropriate conditions. If you REALLY care, then do something better than torque, measuring elongation is best, something like a Subaru head bolt tightening sequence is good too (set, release, bring to low torque and turn fixed amount of rotation).
 
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