Quote:
Originally Posted by alan s4
"The recommended grease is molybdenum disulphide. Always apply grease if the manual shows it otherwise the torque wrench will click before you reach the recommended tightness."
Every day a school day, didn't realise that, makes sense now that I think about it.
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The resistance to turning is provided by friction on the threads, so indicated torque is a measure of axial tension on the bolt.
If you lubricate the threads, you'll raise that tension applied for the same indicated torque and likely strip the thread or snap the bolt if it wasn't meant to be lubricated or as suggested above, fail to lubricate as indicated and the bolt will be under-tightened.
An oiled thread will produce around twice the the tension as a dry one for the same applied torque.