I would put some sort of lube on them, I have copper anti-seize on my brass lug nuts, and I would put it on my spinners.
I believe any thread that is in use like that needs lubrication to keep the threads from galling, and premature wear.

In that case Glen, they would not need to be torqued down as much, thus making them last longer.

 

Fine for splines. I would not use on spinner & hub threads. Products containing 3 to 5% by mass of molybdenum disulphide will do a better job than copper but copper is fine in that application. Your splines will be fine. I have Moly on my splines in a drying & coating base that sticks like **** to a blanket.

 

You may do as you wish Jeff. Your torque assumption is wrong ~ We are talking spinners & hubs here ~ nothing else. The spinners & hub threads require zero lubrication. They are not in motion with one another and as MWS points out the spinners will find their own ideal torque by driving. They are 100% right. Galling is a form of wear caused by adhesion between sliding surfaces. When a material galls, some of it is pulled with the other contacting surface.

Lubricating spinner & hub threads will increase torque as they will tighten further with use. All torque values for nuts, bolts etc. etc. are specified dry unless otherwise stated. If you are worried about water ingress or whatever creeping into threads after torquing apply protection like Tectyl after torquing externally.

e.g. If you lubricated your head dome nuts you would be over torquing vs specification.