Calculating Joint (Load in lbs or Kn) requirement for a compression lug on top of a bus bar
1kV should not be the spec rather , you want a gas-tight (oxide-free) joint to Not exceed xxx microhms.  xxx=TBD.

This is easy to measure with say 10A and 1mV resolutution.

In my experience the shear forces of the threads and number of threads allowed me to easily achieve 100mohm max.  This was my design and was approved by UL for an earth bond connection over power-coat painted sheet metal chassis.   

I relied on the surface area of the threads between two nuts on a welded stud AND a sharp star washer interface to gouge between the crimped circular lug and the nuts to meet an IEC spec for ground wire to chassis spec.  Torque was not important in this design to meet 100 mOhm max with lots of margin.