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Long ago my little sister called me up– she had gotten a flat tire on the freeway and could not get the lug nuts off. I had to traipse out on a -5 degree snowy day to help her out, and she was right, the lug nuts were on tight and the awful Minnesota salt and consequent rust had not helped either. I actually split a good Craftsman 17mm socket in two in trying to get one of the nuts off.
Ever since then I’ve been putting on a smudge of the silvery (or now coppery) anti-seize compound on the threads before tightening down the lug nut.
But of course this gets you wondering— does this make it easier for the lug nut to loosen itself under normal driving? My somewhat tenuous grasp of friction does not give me any intuitive answer.
To compound this puzzle, I think long ago I read somewhere that if you are torquing down a bolt with a torque wrench, you should lubricate the threads and also under the bolt head, so that you’re not measuring the bolt-head friction, apparently the torque spec wants to assume all the torque is as a result of the threads pulling things tight. So should we put anti-seize on the lug nut to wheel mating surface too? So many puzzles!
Many thanks in advance.
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