FWIW, I "reasearched" (heh) this a couple of years ago, because I was worried
about overtorqueing the lug bolts on my Audi. The German car's alloys are to
be torqued to 90 lb-ft, but I wanted to slather them with a high-temp
anti-sieze. Now, because the threads would be lubricated, torqueing them to
the regulation setting would overstrain the bolts.
Unless otherwise specified, torque specs are always given assuming clean, dry,
rustfree threads.
I eventually stumbled across an engineering thumbrule, that when tightening
lubricated fasteners, torque them to 2/3 of the dry-thread spec.
Anyhow, it's been three years and the wheels haven't fallen off yet. (And the
summers and snows get swapped twice a year, no problemo.)
Any gurus out there? Please chime in!
--
Douglas Frank Compaq Computer Corp.
ZKO 110 Spit Brook Rd. The older I get,
603-884-0501 Nashua, NH USA 03062 the better I was.
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