Quote:
Originally Posted by jcslocum
Bolting is what is do for a living and if there is a torque value, it has been calculated using a lubricant. In fact there are so few non-lubricant applications it's not worth mentioning.
The lube used will change the applied torque because some are more slippery than others. Oil slippery but not in a good way for bolts vs. moly, very slippery and good for bolting. For the car, a standard anti-sieze is good. For special applications the lube would be chosen taking into account many different aspects of the use.
In a typical industrial application, 90% of your turning force is used to overcome friction, so a change in lube can have a big effect on the residual load. The residual load or clamping force, or elongation is what engineering is interested in.
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Exactly............
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