Locktite?
Only if the instructions tell you to.
They will never tighten correctly dry. Wheels oin trucks come loose all the time due to the fact they were not properly clamps despite the fact the bolt stopped turning. Torque does not measure clamping power, its only resistance to turning, quits turning, connection not tight. And you do want them to break free when its time to remove them.
So, that's a twofer.
Yes it is. Its often used where the joint cant be tightened or clamped, a tapered connection like a ball joint or tie rod where they traditionally use an additional keeper. Yes, other places too/ Used a lot where its difficult to control the labor.
Very true. The wrench will be accurate. We just don't know how the object the force is being applied to will respond.
The force will always be applied around a center pivot, it will never change. Yallz correct.
They were simply stating that they wanted clean lightly lubed threads, no it doesnt change the tool but they listed all the pitch and grade fasteners with a recommended torque. Applying 50# to a dirty rusty or even simply dry thread will result in a different clamp pressure. Really greatly,,, hugely effects the start or restart torque.
That's not terribly surprising. There are a lot of subtleties to consider. The theory of the bolted joint occupied a full semester in mechanical engineering school.
Lots of torque specs either say or assume "clean dry threads". Unless the spec says to lube, well, why would you?
Fair enough but the end result is the availible stretch of the stud- which is why we always snap grade 5 (or worse,grade 3) 1/4-20 bolts in gear...