You don't say for what application. Lug nuts, spark plugs, or?
For lug nuts, there is a liability issue. Anything that might encourage a lug nut to loosen will eventually be used in court as evidence of negligence, even if the nuts in question have been removed and re-installed multiple times. Manufacturers would rather their customers pay to replace broken lug bolts than sue them for wheels falling off.
Mainly it's a matter of assembly costs. In most cases it is cost-prohibitive to add sealant or anti-seize during installation. Instead, manufacturers use fasteners with pre-applied sealants. These sealants serve multiple purposes; although they're primarily locking agents, they also prevent corrosion and aid in disassembly.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
... [Read Article]
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