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Perhaps we should demystify "deformation" and the effects of lubrication on torque for those who are new to the game. Fasteners are supposed to stretch in order to exert holding power. The tensile strength and diameter of the fastener play into the proper torque. Fasteners which do not have girlie configuration , know as "waisted" can be torqued to the universal tables, SAE and metric. The TTY fasters (waisted, not wasted) typically take torque plus additional rotation. Lubrication of fasteners is tricky. Spark plugs, for instance, in galvanize are already lubricated via the coating in dry state. Many still put a thin "dry"oil film on plugs (I wipe the threads after a tiny drop of oil). Lubrication can cause excess torque to be applied. There are guides to how much apparent torque should be reduced when using a specific lubricant. I hope this is well received and does not irritate experienced folk. Just tell me to STFU if so.
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